Latin American Transit Board Composition: An Addendum to Day's Analysis

An extension of Richard Day's "Put real experts in charge of transit" (A City That Works, March 2026)

Board rosters verified 27 August 2026. An earlier version of this analysis, based on March 2026 rosters, is archived in data_2026_03/; see §6 for what changed and why.

This version adds the 20-member board of Chicago's new Northern Illinois Transit Authority (§2.6), verified the same day. NITA is a comparison agency and is not counted in the 42-member Latin American totals.

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1Introduction

Richard Day's analysis of transit board composition across 16 agencies in Asia, Europe, and the United States reveals a striking pattern: the best-performing transit systems tend to be governed by boards dominated by transit operations experts and professional managers, while the worst-performing systems are governed by elected officials and community advocates with no transit background.

Day's data shows:

• Asian boards are 88–100% transit experts + professional management (Tokyo Metro: 57% transit ops, Seoul: 40%, MTR Hong Kong: 22%)
• European boards are mixed, with significant labor representation (BVG Berlin: 50% labor, RATP Paris: 33% labor) alongside transit and management professionals
• US boards are dominated by elected officials and community advocates (LA Metro: 86% elected officials; CTA Chicago: 50% community advocates + 50% other management/policy with zero transit expertise)

The gap in Day's analysis: No Latin American agencies are included. This matters because LatAm cities operate some of the world's largest and most complex metro systems — Santiago, Mexico City, and São Paulo each carry over a million daily riders — and their governance models reflect a distinct political tradition of state-owned enterprise management that doesn't map neatly onto the Asian, European, or American frameworks.

Methodology: We identified every current member of the board of five major LatAm metro agencies — 42 people across 5 boards — and classified each using Day's five-category framework. Rosters were first researched in March 2026 and fully re-researched on 27 August 2026 against agency filings, official gazettes, and regulatory disclosures. Sources and a confidence rating are recorded per member in data/. Seven classifications required a judgment call; all seven are documented in §6.

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2Agency Profiles

Metro de Santiago — Santiago, Chile — 7 members

Governance model: State-owned corporation (Empresa de Transporte de Pasajeros Metro S.A.) with a 7-member board (Directorio) appointed by the national government through the shareholders' meeting (Junta de Accionistas). The Chilean state, represented by the Treasury (Fisco de Chile) and CORFO, holds 100% of shares. Metro's bylaws historically provide for two-year board terms with indefinite reelection, but multiple April/May 2026 news reports describe the board seated on April 27, 2026 as serving for 'the next four years' (coinciding with President Kast's four-year presidential term); this discrepancy could not be resolved with the sources available (see notes).

Closest comparison in Day's data: MTR (Hong Kong) (22% / 72% / 0% / 0% / 6% across 18 seats), against Santiago's 29% / 71% / 0% / 0% / 0%.

Change since March 2026: 0 of the 7 people recorded in March remain; the board was 29% / 71% / 0% / 0% / 0% then and is 29% / 71% / 0% / 0% / 0% now.

Notes: The entire board was replaced at an ordinary shareholders' meeting on 27 April 2026, following the change of national government the month before; none of the seven people recorded in March remains. The current roster was verified against both Metro's own governance page and the company's filing with the CMF, Chile's securities regulator, which agree on the same seven names and an appointment date of 27 April 2026. Two details are unsettled: press reports describe a four-year term where summaries of the company bylaws describe two years with indefinite re-election; and two outlets described Rodrigo Troncoso as an architect, where Metro's own page and his university profile identify him as a commercial engineer with a doctorate in economics, which is what this record uses.

Metro de Medellín — Medellín, Colombia — 7 members (of 9 seats; 2 vacant)

Governance model: Mixed-ownership company (sociedad de economía mixta) structurally organized as a 9-member board: 4 ex-officio seats from subnational government (Mayor of Medellín, Director of Planning of Medellín, Governor of Antioquia, Director of Planning of Antioquia) and 5 seats whose appointment power rests with the national government (2 ministry representatives — Transport and Finance — plus 3 independents named by the President). As of the verification date, only 7 of the 9 principal seats are filled; the 2 independent presidential-appointee seats are vacant (see notes). Whichever national administration holds the presidency controls appointment of the 5 national seats, giving the national government a structural majority when all seats are filled.

Closest comparison in Day's data: Metro de Madrid (20% / 50% / 0% / 0% / 30% across 10 seats), against Medellín's 14% / 57% / 0% / 0% / 29%.

Change since March 2026: 4 of the 9 people recorded in March remain; the board was 0% / 78% / 0% / 0% / 22% then and is 14% / 57% / 0% / 0% / 29% now.

Notes: The board is structurally nine seats. Two of the three independent presidential-appointee seats are listed as vacant on Metro's own roster, so seven are filled — the board has not shrunk. Three seats changed hands since March: the Antioquia planning director (by governor's decree of 16 July 2026), the Medellín planning director, and the Ministry of Transport representative. Colombia's presidential transition on 7 August 2026 makes further turnover plausible, but is not confirmed as the cause of any of these changes, and the cause and timing of the two vacancies could not be established. Metro's website is internally inconsistent — a departed member's biography page still resolves while the roster marks that seat vacant — so it should not be treated as authoritative for current membership.

STC Metro — Mexico City, Mexico — 11 members

Governance model: Decentralized public body (organismo público descentralizado) governed by a Consejo de Administración (Board of Directors) composed of government officials and institutional representatives, chaired by the Secretary of Mobility. Per Article 7 of the Estatuto Orgánico (reconstructed from the July 2018 text, which is the most recent version whose full Article 7 text could be retrieved — see notes on statute currency), the statutory voting seats are: from CDMX centralized administration — Secretary of Mobility (President), Secretary of Government, Secretary of Finance (now Secretaría de Administración y Finanzas, which absorbed the Oficial Mayor seat when that post was eliminated in 2019), Secretary of Works and Services; from CDMX parastatal entities — the Director General of Servicio de Transportes Eléctricos (STE) and the head of 'Sistema de Movilidad 1' (the 2016-2019 legal name of RTP/Red de Transporte de Pasajeros, now reverted to RTP but apparently not relabeled in Article 7's text — the seat is held by RTP's current Director General); from the federal government — a representative of SICT (formerly SCT) and a representative of Banobras; and one representative designated by the State of Mexico. Article 7 (2018 text) also references one public commissioner ('comisario público', voice but no vote) and, per a 2001 agreement, two citizen comptrollers ('contralores ciudadanos') — see notes; these are non-voting oversight roles, not counted among the board members below. The Director General of STC is NOT listed as an Article 7 Council seat; available evidence indicates the Director General is the administrator/executive appointed by the Jefa de Gobierno who implements Council resolutions and reports to the Council (commonly functioning as its non-voting secretary in this type of CDMX decentralized body), rather than a voting member — he is nonetheless included below because he is the agency's chief executive and because prior analysis specifically asked that his classification be documented. The union (SNTSTC) has no Article 7 seat; its participation in Council sessions stems from an administrative agreement announced by the STC Director General in 2013-2015 under instruction from then-Head of Government Miguel Ángel Mancera, granting the union attendance at Council sessions and two seats on the Comité de Incidentes Relevantes — not a statutory board seat. A separate Consejo Consultivo (advisory council) of outside experts, academics, and civil-society representatives exists alongside the Consejo de Administración (referenced in modifications from 2018 and again in 2024) but is a distinct body. There are no independent/community-appointed voting members on the Consejo de Administración itself.

Closest comparison in Day's data: Metra (Chicago) (9% / 55% / 9% / 9% / 18% across 11 seats), against Mexico City's 9% / 64% / 9% / 0% / 18%.

Change since March 2026: 9 of the 11 people recorded in March remain; the board was 9% / 64% / 9% / 0% / 18% then and is 9% / 64% / 9% / 0% / 18% now.

Notes: STC Metro's council is defined by Article 7 of its Estatuto Orgánico. The current full text could not be retrieved — the agency's own website was unreachable throughout this research — so the seat list is reconstructed from the 2018 version plus corroborating sources and is rated medium confidence. Three seats are institutional, and the individuals holding them are not publicly identified: the federal transport ministry, the development bank Banobras, and the State of Mexico. The director general is not an Article 7 voting seat but the appointed administrator who reports to the council. The union seat is not statutory either; it derives from a negotiated agreement of 2013–2015 and may be participation in sessions rather than a vote. The statute also provides for a public commissioner and two citizen comptrollers without votes, who are not counted here.

Metrô de São Paulo — São Paulo, Brazil — 11 members

Governance model: State-owned mixed-capital company (sociedade de economia mista) controlled by the São Paulo state government. Per the company's 2025 Integrated Report, the Conselho de Administração (Board of Directors) has 7–11 members elected by the General Assembly for unified two-year terms with reelection permitted (a Moody's credit report instead cites a 3–11 range, which this file treats as a likely paraphrase of the bylaws rather than the authoritative figure). The board must include the CEO (Diretor-Presidente), an employee representative, minority-shareholder representatives, and independent members. As of this update the board is at its statutory maximum of 11 seats. The Diretoria Executiva (Executive Board) has up to 6 directors appointed by the Conselho de Administração.

Closest comparison in Day's data: LTA (Singapore) (12% / 76% / 6% / 6% / 0% across 17 seats), against São Paulo's 18% / 73% / 9% / 0% / 0%.

Change since March 2026: 4 of the 9 people recorded in March remain; the board was 0% / 89% / 11% / 0% / 0% then and is 18% / 73% / 9% / 0% / 0% now.

Notes: The March version of this record was drawn from a mirror site serving a 2023 roster and wrongly listed three former directors. This version uses the company's official Relatório Integrado 2025, its Comunicado ao Mercado of 11 May 2026, and its governance portal, which was reachable this time after returning a server error during the March research. The board grew from nine members to eleven — its statutory maximum — at an extraordinary general assembly on 28 April 2026, with three members leaving and five joining. The exact dates and stated reasons for those three departures were not found.

SBASAU — Buenos Aires, Argentina — 6 members

Governance model: City-owned corporation. SBASE was transformed from a Sociedad del Estado into a Sociedad Anónima Unipersonal (SBASAU) via Decreto 20/2026 (published Boletín Oficial CABA, January 2026), implementing the conversion mandate of national DNU 70/2023 (Art. 48) for all state-participation companies. Ownership remains 100% GCBA; the change is a legal-form conversion, not a privatization, and Subte operations remain concessioned to Emova. Per the SBASE/SBASAU Estatuto, Título IV 'Dirección y Administración,' Artículo Noveno, the Directorio is composed of a Presidente, a Vicepresidente, and cuatro (4) Directores Titulares — six seats total — all designated by the Asamblea (GCBA, as sole shareholder) for three-year terms. A separate Comisión Fiscalizadora (statutory auditors — currently Mariano Edmundo Barroso, Jorge Iwanczuk, and Francisco José Olivero Majdalani per the official GCBA governance page) performs audit functions and is NOT part of the Directorio; it is excluded from this member list per the agency's own organizational chart.

Closest comparison in Day's data: SMRT (Singapore) (15% / 85% / 0% / 0% / 0% across 13 seats), against Buenos Aires's 0% / 100% / 0% / 0% / 0%.

Change since March 2026: 4 of the 7 people recorded in March remain; the board was 43% / 57% / 0% / 0% / 0% then and is 0% / 100% / 0% / 0% / 0% now.

Notes: SBASE was converted into a sociedad anónima, SBASAU, by decree in January 2026. The board has six seats. Two members are new since March: Mario Sebastián Sabugo, and Víctor José Colombano, designated at an ordinary general assembly on 15 January 2026 and confirmed here through his own conflict-of-interest filing. Three people recorded in March — Eduardo José Moreno, Bernarda Balestra and Jorge Kogan — are no longer on the board; Kogan's membership had only ever been inferred from a resolution signature and is now resolved as not current. Statutory auditors (the Comisión Fiscalizadora) and executive titles such as director general are excluded, since neither is a board seat.

NITA — Chicago, United States — 20 members

Governance model: Regional authority created by the Northern Illinois Transit Authority Act, replacing the Regional Transportation Authority and holding financial, budgetary and planning oversight of the CTA, Metra and Pace. Twenty seats, five each from the Governor of Illinois (with the advice and consent of the Illinois Senate), the Cook County Board President, the Mayor of Chicago, and the five collar counties (one each from DuPage, Kane, Lake, McHenry and Will). No separately appointed chair — the board elects its own at its first meeting in September 2026. Seventeen of the twenty directors also hold a seat on the CTA, Metra or Pace board, a deliberate cross-appointment intended to force coordination. There is no designated labour seat, no rider or community seat, and no statutory requirement that any director hold transit qualifications.

Two readings of Day's categories give materially different answers for this board, so both are published (see §6):

Closest comparison in the data: under the written rules, two boards tie exactly for closest to NITA's 10% / 60% / 5% / 5% / 20% — Metra (9% / 55% / 9% / 9% / 18%), one of the three service boards NITA now oversees, and STC Metro in Mexico City (9% / 64% / 9% / 0% / 18%). Under Day's applied practice nothing in the dataset is close: the nearest rows, RATP Paris and TfL London, are both far off, and NITA's 25% / 25% / 5% / 25% / 20% under that reading is the most evenly spread board in the study.

Notes: All 20 seats are filled, but announced is not the same as seated. The Governor's five appointees still required Illinois Senate confirmation on the verification date, and the Senate had no session day between the 21 August announcement and 27 August. Chicago's five were confirmed by the City Council on 15 July 2026 and Cook County's five by the County Board on 16 July 2026; for three collar-county appointees no confirmation vote could be found. Most seats take effect on 1 September 2026. One appointee's employer could not be established from any source that also names him as the appointee, and is recorded as unknown rather than guessed.

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3Comparative Analysis

Where LatAm Falls on Day's Spectrum

Across all 42 board members in the five agencies:

1. The management/policy monoculture: 71% of LatAm board members are professional managers and policy experts without transit operations backgrounds. This reflects a governance philosophy where transit agencies are seen as state-owned enterprises to be managed by generalist technocrats, not as specialized operations requiring domain expertise.

2. Transit expertise is thin and unevenly spread: 6 of 42 members (14%) have transit operations backgrounds. Four of the five boards have at least one; Buenos Aires has none. Three of the six rest on judgment calls documented in §6, so this figure should be read as an upper bound.

3. Labor representation is minimal: 2 of 42 members (5%), and both sit in agencies where a labor seat is legally mandated or negotiated (São Paulo by Brazilian corporate law, CDMX by union agreement). This is far below European levels (RATP 33%, BVG 50%).

4. Community advocates are completely absent: Zero community advocates across all five agencies, in both the March and August rosters. This is the starkest difference from the US model, where community advocates comprise significant portions of boards (CTA 50%, MTA New York 20%).

5. Elected officials are present but concentrated: At 10%, elected official representation is far below US levels (LA Metro 86%, Pace 92%) but above Asian levels. They appear in only two agencies — Medellín, where the Mayor and Governor sit ex officio, and Mexico City, where two career politicians hold appointed seats.

LatAm vs. Day's Three Regions

LatAm's spread on transit expertise runs from Buenos Aires (0%) to Santiago (29%) — a narrower range than Asia's (12–57%), and comparable to the US (0–21%). What distinguishes the region is not variance but the floor under generalist management: every LatAm board is at least 57% other management/policy, and one is 100%.

Agency-to-Agency Comparisons

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4Notable Findings

The Boards Changed; the Profile Did Not

Between March and August 2026 these five boards turned over heavily. Santiago replaced its entire board following a change of national government; Buenos Aires, Medellín and São Paulo each replaced or lost multiple members:

Yet the aggregate profile barely moved. The March snapshot recorded 14% transit ops / 72% other management / 5% labor / 0% community / 9% elected. The August rosters, with substantially different people in the seats, produce 14% / 71% / 5% / 0% / 10%. Board composition in these agencies appears to be a property of the institutions rather than of the individuals who happen to occupy them — which is the strongest argument in this analysis that governance structure, not appointment luck, determines who ends up on a transit board.

CDMX: Governance as the Story

STC Metro's Consejo de Administración is not a board in the conventional sense — it is a committee of sitting government officials. Of its 11 seats, three are unnamed institutional placeholders (federal transport ministry, Banobras, State of Mexico) whose individual occupants are not publicly identified. The union seat, held by Fernando Espino Arévalo, is not established by the agency's statute at all; it derives from a negotiated agreement and may be session participation rather than a voting seat. Espino has led the union since the 1980s and simultaneously served six terms as a federal or local deputy between 1991 and 2015.

The Complete Absence of Community Voice

Across 42 board members, five agencies, five countries, and two separate rounds of research five months apart, not one seat is held by a rider advocate, a community organization representative, or a demographic-group delegate. This is the most robust finding in the analysis — it survived a full re-research and independent verification of every roster. In Day's US sample the same category reaches 50% (CTA Chicago) and 20% (MTA New York).

Medellín: Celebrated System, Political Board

Metro de Medellín is the most internationally celebrated system in the sample, and its board is 29% elected officials — the Mayor of Medellín and the Governor of Antioquia, both ex officio — with 14% transit operations expertise resting on a single judgment call. Two of its nine seats sit vacant. In the March snapshot the board had no transit expertise at all; the difference is one new Ministry of Transport appointee whose classification is genuinely arguable (see §6).

Buenos Aires: A Board of Generalists

SBASE — now SBASAU following its January 2026 conversion to a sociedad anónima — is the only board in the sample with no transit operations expertise whatsoever. All 6 directors classify as other management/policy. The March snapshot recorded this agency as having the highest transit expertise in the sample at 43%; that figure was wrong, and the correction is documented in §6.

Corporate Restructuring

Three of the five agencies operate as corporations with formal boards rather than as government departments: Metro S.A. (Chile) files with the securities regulator, Metrô de São Paulo publishes investor-relations disclosures, and SBASE was converted to a sociedad anónima in January 2026. This corporate form is what makes their board composition legible at all — CDMX, which is not structured this way, is correspondingly the hardest to document.

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5NITA: The Board That Prompted the Question

When the first version of this analysis was written, NITA's board did not exist and this section was a set of predictions. The appointments have now been made — all twenty seats, by four sets of appointing authorities, between June and August 2026 — so the predictions can be checked.

What the reform actually changed

Day's March 2026 data covers the four boards NITA replaces or oversees: the RTA (14 seats), CTA (6), Metra (11) and Pace (13). Across those 44 pre-reform seats his classifications give (his RTA roster is one director short of the 15 then serving — see §6 — so these are his counts, not a recount):

The unambiguous change is political. Elected officials fall from 36% of pre-reform Chicagoland transit seats to 20% of NITA's — and the four who remain are all suburban or collar-county mayors, none from the City of Chicago. That matches Day's own read that there will be "fewer local politicians with control over a regional system."

Whether transit expertise rose depends on which reading of his categories is used, which is why both are published. Under the written rules it barely moved: 9% before, 10% after. Under his applied practice it rose sharply, from 9% to 25%. Day states that transit-operations experience "more than doubled (from 8% to 18%)" across these boards — a claim that sits between the two readings, and closer to his own practice, which is what one would expect. His 8% could not be reproduced from his own published data, which gives 9% (4 of 44 seats) — see §6.

The five predictions, tested

1. "Generalist management is the global default, not a Chicago failing." Confirmed. Under the written rules NITA is 60% other management/policy, inside the Latin American band of 57–100% and above every board in Day's dataset except SMRT Singapore, LTA Singapore, MTR Hong Kong and WMATA. The prediction was that appointing generalist professionals would not deliver transit expertise, and that is what happened: twelve of the twenty are lawyers, financial officers, procurement and technology managers, planners and nonprofit executives.

2. "Expertise requires an explicit mandate." Confirmed. The NITA Act carries no requirement that any director hold transit qualifications, and under the written rules two of twenty directors have direct transit operations experience: Romayne Brown, who spent 31 years at the CTA and finished as Vice President of Rail Operations overseeing a $1.3bn budget, and Luis Montgomery, a civil engineer working in transportation infrastructure. Only Brown's case is unambiguous under either reading. Every transit-qualified appointee got there by accident of biography rather than by a seat that demanded it. Where a seat does carry a mandate it works exactly as written: the Pace seat reserved for sitting or former mayors duly produced a mayor.

3. "Ex officio seats import politics automatically." Confirmed, with an important amendment. NITA has no ex officio seats at all — and still seated four sitting or former mayors, because collar-county boards chose to appoint their own. Removing the statutory channel did not remove the politics; it moved it from the statute to the appointer's discretion. Three of the four came from the collar counties, which Day graded lowest.

4. "Board composition is institutionally sticky." This is the prediction that needs revising, and the revision strengthens the underlying claim. In Latin America, five boards replaced most of their members in five months and produced almost identical composition — people changed, structure didn't, composition didn't. In Chicago the structure itself changed, and composition moved: elected officials nearly halved. Taken together the two cases say the same thing from opposite directions. Structure, not appointments, is the lever. The Latin American boards show what happens when you pull only the appointment lever; NITA shows what happens when you pull the structural one.

5. "Community voice doesn't have to mean zero expertise — but zero community voice is a real choice." NITA sits between the two extremes, and where exactly depends on the reading: 5% community advocates under the written rules — a single seat — against 25% under Day's. Either way it is not the Latin American answer of zero. It is worth noting that NITA achieved this without a designated community seat, just as it has no designated labour seat and yet seated a building-trades council president.

The finding that was not predicted

Under the written rules, two boards tie exactly for the closest match to NITA's 10% / 60% / 5% / 5% / 20% anywhere in the 22 agencies studied. One is Metra (9% / 55% / 9% / 9% / 18%) — a board NITA was created to supervise. The other is STC Metro in Mexico City (9% / 64% / 9% / 0% / 18%).

Neither is flattering. Resembling Metra means the new regional authority looks like the service board it is meant to hold to account, which is an odd result for a reform whose premise was that the old arrangement was not working. And Mexico City's Consejo de Administración is not a board in the conventional sense but a committee of sitting government officials — the agency in this study whose governance was hardest to document and whose seats are partly unnamed institutional placeholders.

The Mexico City resemblance is in the numbers, not the mechanism. NITA's directors are independently appointed individuals, not cabinet secretaries sitting by virtue of another office, and its appointments are documented in public council records to a standard Mexico City's are not. But the profile a reformed Chicago produced — a large board of credentialled generalists with a thin layer of transit expertise and a fifth of the seats held by politicians — is the profile the region's least legible governance model produces too.

If NITA's purpose was to look less like the RTA, it succeeded: the politicians are down by nearly half. If it was to look like Tokyo, Seoul or Hong Kong, it did not. Those boards run 22–57% transit operations experience. NITA reaches 25% only on the most generous reading of who counts, and 10% on the reading used throughout this site.

6Methodology & Limitations

How this was researched

Rosters were first assembled in March 2026 and fully re-researched on 27 August 2026. Every member record in data/ carries source URLs and a confidence rating. Primary sources were preferred throughout: securities filings (CMF Chile), investor-relations disclosures and integrated reports (Metrô de São Paulo), official gazettes (Boletín Oficial de la Ciudad de Buenos Aires, Gaceta Oficial de la Ciudad de México), and governor's decrees (Antioquia).

The NITA board was researched separately on 27 August 2026 and is recorded in data_chicago/. Each of the twenty was verified against the appointing authority's own announcement — the Governor's newsroom release, the City of Chicago's appointment and City Council confirmation releases, Cook County coverage and the county board's committee record, and the individual collar-county releases — rather than from secondary summaries. Richard Day's own one-line biographies of these appointees were deliberately not used as a source for anyone's record: they are compressed, and they misspell at least one name.

Calibration against Day's own classifications

Adding a board classified by this project to a chart of boards classified by Day raises an obvious question: are the two doing the same thing? This is now testable. Nine of the twenty NITA appointees sat on the RTA, CTA, Metra or Pace boards in March 2026 and therefore appear in Day's published member-level spreadsheet with his own category attached. Each was classified here from primary sources first, and compared with his afterwards.

Matching was done on name plus board context, and two of the nine — Rosa Ortiz and Gary Gordon — have common enough names that the match was initially held as probable rather than certain. Both were then pinned by details established independently: the Governor's release states Ortiz has sat on the CTA board since 2021, which is the board Day lists her under, and Gordon is Lake County's Metra representative and the Shedd Aquarium's chief financial officer, both of which appear in Day's row for him.

Six of the nine agree — Ortiz, Kotarac, Brown, Noak, Gordon and Sager. The three disagreements all run the same way:

The pattern is that Day's stated rules and his applied classifications diverge. His written definition of transit expertise requires significant direct experience managing transit operations or capital projects; in practice he counts senior employment at a transit agency, including legal and administrative roles — Jenkins was a senior attorney at the CTA, Mondero its chief administrative officer. The same divergence appears in his labour category: his definition requires an explicitly designated union seat, but he classifies a LIUNA apprenticeship director and a Chicago Federation of Labor official on the RTA board — which has no such seat — as Labor Representatives.

Neither reading is wrong; they are different readings of the same framework. Rather than assert one, both are published throughout: the headline figures use the written rules, consistent with how all 42 Latin American members were classified, and Day's applied practice is given alongside. Seven of the twenty NITA members classify differently under the two readings; three of those seven are Day's own published calls and four are this analysis's reading of how he would classify comparable people. The choice matters: NITA is 10% transit operations expertise under the written rules and 25% under Day's practice.

One category was decided the other way. Brian Dahl is classified as a Labor Representative under both readings, following Day's practice rather than the written rule, on the grounds that a building-trades council president is a labour representative whatever the seat is called.

One check on Day's figures, and one gap

Every figure in day_chart_reference.json was re-checked against his spreadsheet during this work. All four Chicago agencies match exactly — 44 members, and every count in every category.

Two things did not reconcile:

• His "8%" is not reproducible. Day writes that transit-operations experience across these boards rose "from 8% to 18%". His own data gives 9% before the reform (4 of 44 seats counting the RTA), or 3% (1 of 30) excluding it. Neither is 8%, and the denominator he used is not stated. His 18% is treated here as external corroboration of the direction of travel, not as a figure to match.
• His RTA roster is missing a director. Day lists 14 RTA directors. The RTA is a 16-member board — five appointed by the Mayor of Chicago, four by the suburban members of the Cook County Board, one by the Cook County Board President, five by the collar counties, plus a chairman elected by the others — and 15 of those seats were filled. Oswaldo Alvarez was approved as an RTA director by the full Chicago City Council on 16 October 2025, by 47 votes to nil, five months before Day's article, and was still serving in July 2026. He is not among Day's 14. Checked against the RTA's own current roster, all 14 of Day's names are still serving and Alvarez is the only addition, so this is the same roster with one person left out rather than a deliberately narrower list. The practical effect is small — his RTA transit-operations share is computed over 14 seats where 15 were filled — and day_chart_reference.json continues to reproduce his published figures rather than correcting them.

Corrections to the March 2026 version

The March analysis contained errors serious enough to change its headline findings. They are recorded here rather than quietly removed.

1. Buenos Aires — a misattributed biography. Guillermo Seefeld was described as a former Secretary of Traffic and Transportation of Buenos Aires and former national Undersecretary of Land Transport, and classified as transit expertise on that basis. Those roles belong to Gustavo Álvarez, a different SBASE director. The source cited in support of the claim describes Seefeld only as a PRO party figure and the brother of an actor. This single error was responsible for the claim that Buenos Aires had the highest transit expertise in the sample (43%) and was "on par with Seoul Metro." It did not.

2. São Paulo — three people who were not on the board. The March research could not reach Metrô's governance portal (HTTP 503) and fell back on a mirror site that was serving a 2023 roster. Cleyton Ricardo Batista, Luís Felipe Vidal Arellano and João Jorge Fadel Filho were listed as directors; none was on the board in March 2026. The official Integrated Report naming the correct members had been published four days before the research date.

3. Mexico City — a misassigned seat. Rosario Castro Escorcia (Metrobús) was listed as holding the statutory seat reserved for the director of "Sistema de Movilidad 1." That is the former legal name of RTP, a different agency; the seat belongs to RTP's director.

4. Day's own figures. Comparisons to Day's 16 agencies were originally read off his published chart image. They are now computed from the member-level list he published alongside his article. Three claims about his data were wrong: RTA Chicago's composition was misstated twice, Seoul Metro's 7% community-advocate share was described as elected officials, and the regional range table contained errors in the Asia, Europe and US rows.

5. An unconfirmed member. Jorge Kogan was included in March as a "probable" board member inferred from a resolution signature. He is not on the current board.

Judgment calls

Seventeen classifications could reasonably have gone the other way — seven across the five Latin American boards, and ten on NITA. Each is recorded here and flagged in the member data, because the aggregate transit-expertise figures depend on them. For Latin America: classified as shown, transit operations expertise is 14%; under the stricter reading of all seven, it falls to 7%. For NITA: 10% as classified, 25% under Day's applied practice.

Every one of the seventeen was adjudicated by Steffany Bahamon.

The five Latin American boards:

• Rodrigo Troncoso Olchevskaia (Santiago) — classified Transit Ops/Management. Judgment call. An economist rather than an engineer, but his entire research output is transit economics — bus-industry cost and efficiency, fare policy, urban transport modelling. Treated as equivalent to the transit-academic carve-out in the classification rules.
• Liliana Yanneth Bohórquez Avendaño (Medellín) — classified Transit Ops/Management. Judgment call. A civil engineer with ~25 years across Bogotá's mobility secretariat, the national road-safety agency and the Ministry of Transport, who also sits on the board of Metrolínea, Bucaramanga's BRT operator. The case against counting her is that traffic engineering and road safety are not transit operations; the case for is a quarter-century inside transport bodies plus a seat at a transit operator. Counted as transit expertise.
• Adrián Rubalcava Suárez (Mexico City) — classified Elected Official. Judgment call. He sits as an appointed director general, not as an officeholder, which would argue for Other Management/Policy. He is counted as an elected official because he was mayor of Cuajimalpa until 2024 and is a career politician, and because this matches how Day treated the same situation — his own data counts former mayors and appointed cabinet officials sitting on US and European boards as elected officials.
• César Cravioto Romero (Mexico City) — classified Elected Official. Judgment call. A former Morena senator and party faction coordinator now sitting as an appointed cabinet secretary. Counted as an elected official on the same basis as Rubalcava, and consistent with Day's treatment of Berlin's appointed transport senator on the BVG board.
• Daniel Rodrigues Aldigueri (São Paulo) — classified Transit Ops/Management. Judgment call. Holds a doctorate in Transportation and a master's in Transportation Engineering, but has spent his career in ports and civil aviation rather than urban transit. Counted as transit expertise on the strength of the transport training and infrastructure record; a stricter reading of 'worked in transit' would place him in Other Management/Policy.
• Mauro Antônio Gumiero Voltarelli (São Paulo) — classified Transit Ops/Management. Judgment call. Director of Administration, Finance and Infrastructure at SPTrans, São Paulo's bus authority, and briefly its acting president in 2025. SPTrans's own org chart puts his directorate apart from both Operations and Transport Planning, which argues for a back-office reading; holding a directorship and the acting presidency of a transit operator argues the other way. Counted as transit expertise.
• Víctor José Colombano (Buenos Aires) — classified Other Management/Policy. Judgment call, decided the other way. At appointment he declared an employee post of unspecified seniority at ADIF, the national rail infrastructure agency, and an unpaid administrative secretaryship at a rail trade association. His documented career is party political organising and public housing administration, and the conflict-of-interest filing itself describes the trade-association role as administrative support with no fixed hours. Not counted as transit expertise. Separately: his 'congresal nacional' title is a party congress delegate, not an elected seat, so Elected Official does not apply.

NITA:

• Natasha Jenkins — classified Other Management/Policy. Day classifies her Transit Ops/Management. A practising labour and employment attorney whose CTA role was in-house legal work; her Teamsters Local 700 role was as general counsel, not a designated labour seat.
• Dennis Mondero — classified Other Management/Policy. Day classifies him Transit Ops/Management. Senior Vice President and Chief Administrative Officer at the CTA: senior, but administrative rather than operational. The same tension as the Voltarelli call on the São Paulo board, decided the other way here because the written rules govern the headline figures.
• Lester Barclay — classified Other Management/Policy. Day classifies him Community Advocate. Chairman of the Chicago Transit Board since 2021, but three decades of legal practice is his primary background. Note that his pre-2021 chairmanship was of the CTA Citizens Advisory Board, a separate advisory body, not the governing board.
• Brian Dahl — classified Labor Representative under both readings. The written rule requires an explicitly designated union seat and NITA has none, which would place him in Other Management/Policy; Day's practice classifies union officials on their background instead, and that reading was adopted. He is also a former Kane County Board member, but he resigned in 2018, which is not "recently retired".
• Nedra Sims Fears — classified Other Management/Policy. She leads a neighbourhood community organisation, which would support Community Advocate, but her career is community development finance and the rules warn specifically against reading a finance executive in community development as an advocate.
• Diane Williams — classified Other Management/Policy. Three readings compete: 18 years as CEO of a large nonprofit (management), a community-serving mission (Community Advocate), and 16 years as an elected Village of Flossmoor trustee ending in 2021 (Elected Official). Counted on her executive record. Her identity required resolving — press coverage described the Safer Foundation chief executive and a Flossmoor trustee, and it took the Southland Development Authority's own biography to confirm these are one person.
• Oswaldo Alvarez — classified Other Management/Policy. He heads an organisation representing a demographic group, which is inside the Community Advocate definition, but his record is policy strategy and large-programme administration, most clearly Illinois' $47m statewide census operation.
• Nirali Shah — classified Other Management/Policy. She held procurement, contract administration and compliance positions at the CTA, and Day counts transit-agency employment as transit expertise. Her roles are not described as executive and their seniority could not be established.
• Luis Montgomery — classified Transit Ops/Management, decided the other way from the strict reading. A civil engineer leading national transportation market development at an infrastructure consultancy. The rules exclude general civil engineers unless they have worked in transit, and no employment at a transit operator is established — infrastructure consulting is not running transit. Counted as transit expertise on the engineering background and the transport-sector career. His employer is recorded as unknown: a plausible match was found, but no source names the appointee and the firm together, and that is exactly the pattern that produced this site's worst published error.
• Dee Atkins — classified Community Advocate. The two comparable calls on this board, Nedra Sims Fears and Oswaldo Alvarez, were decided the other way. She is counted as an advocate because, unlike them, no separate profession sits beneath the community work. She is the board's only community advocate under the headline reading, so this single call carries a headline figure.

Structural limitations

• Every row carries its own date, and they are not all the same. The five Latin American boards and NITA are current as of 27 August 2026. Day's 16 agencies are as of March 2026 and have not been re-verified here.
• Day's four Chicago rows describe a system that has since been reorganised. They are kept as he published them, as the pre-reform baseline, not as a description of who governs Chicago transit today: the RTA is being wound up, and the CTA, Metra and Pace boards were re-appointed in July and August 2026. New rows for those three service boards are deliberately not published. More service-board appointments were still outstanding at the time of writing, and a board that cannot be confirmed to its full seat list does not get a row here — the same call made earlier for TransMilenio and Empresa Metro de Bogotá, whose national-ministry seats could not be confirmed after Colombia's August 2026 government transition.
• Announced is not the same as seated. Five of NITA's twenty directors — the Governor's appointees — still required Illinois Senate confirmation on the verification date, and three collar-county appointments had no confirmation vote on record. Each member's row states where that stands. Most seats take effect on 1 September 2026.
• Board composition is volatile. Four of these five boards changed membership within five months. Any snapshot goes stale quickly, and agency websites lag reality — Metro de Medellín's own board page listed a member weeks after the decree replacing him.
• Three CDMX seats are institutional, not individual. The federal transport ministry, Banobras and State of Mexico representatives could not be identified by name and are counted as institutional seats.
• Not every claim is equally sourced. Records carry High, Medium or Low confidence. Low-confidence records should be treated as leads rather than findings.
• Category boundaries are contestable. Day's five categories were designed for his sample; applying them to state-owned enterprises in a different legal tradition requires judgment at the margins, as §6's seven calls illustrate.