Muni Metro Advanced Train Control System & Its Replacement
Muni Metro drivers steer by hand on San Francisco's streets, then hand the train over at the subway portal: the Advanced Train Control System drives it through the Market Street tunnel, with the operator aboard and ready to take back control. The 1998 cutover gridlocked the subway — trains sent down wrong tracks, emergency brakes dropping, riders forcing doors open underground — and problems lingered for weeks. SFMTA now calls the 1980s technology obsolete and signed a US$212M Hitachi Rail replacement in January 2025, running to 2034.
Live
📅 since 1998
✔ Editor-reviewed
📊 Impact
SFMTA reports the ageing system causes daily delays: a train that loses its data link to ATCS must run in manual mode at half its maximum speed, which slows every train behind it. SFMTA and Hitachi Rail project the replacement will add up to 20% capacity — a target, not a measurement. No independent audit of either figure was found.
🎓 Lesson
The date a contract is signed, the date a system is cut over and the date it works are three different dates. Muni switched on ATCS and the new subway turnback together in 1998 and lost the tunnel for weeks; the replacement contract was signed in January 2025 and does not finish before 2032.
Evidence🏛️ Official
Scale🏙️ City-wide
Cost≈US$700M programme across seven phases (SFMTA); US$212M Hitachi Rail design-and-supply contract plus up to US$114M for ten years of support (2032-2042)
FundingSFMTA capital plan plus California TIRCP state grants — US$30M for Phase 1 in July 2022 and US$130M for Phase 2
Sources
↗ SFMTA — How Automatic Train Control Keeps Muni Metro Running (authority)The load-bearing source for the hybrid. 'The ATCS operates trains in the subway, keeping them safely and appropriately spaced apart by controlling train speeds, switches and signals', while 'Muni Metro trains operate under the control of the train operator on San Francisco streets'. An operator rides every train and 'is always prepared to take over if necessary'. Also the failure mode: when the handshake fails 'the train must travel in manual mode at half its maximum speed, which also slows all other trains along the network'. Calls ATCS 'one of the first computerized train control systems in the United States' — the entry attributes rather than asserts that.
↗ SFMTA — Train Control Upgrade Project (authority)Dates and characterises the system being replaced: 'based on 1980s technology that was installed in the Market Street subway in 1998', 'designed to last 20 to 25 years', with obsolete components that 'are no longer made'.
↗ SFMTA — Train Control Upgrade Project: Project Phasing (authority)Seven overlapping phases. Phase 1 installs CBTC 'at street level along the Embarcadero and Third Street corridors' from 2026; Phase 2 installs and activates it 'in the subway alongside the existing Automatic Train Control System' in 2027 or 2028; N Judah around 2028, T Third/K Ingleside/M Ocean View 2029, J Church/L Taraval 2030; 'complete installation between 2032 and 2034'.
↗ SFMTA — SFMTA partners with Hitachi Rail to upgrade Muni Metro technology (authority)Contract source, sentence-level: 'We finalized a historic supplier contract with Hitachi Rail in January 2025.' Approximately US$212M for design and procurement, up to US$114M for ten years of post-project support 2032-2042, and an option on a further US$238M for 2042-2052. Describes the existing installation as '30-year-old tech in the subway'.
↗ SFMTA Board of Directors calendar item (authority)Source for the delay claim: 'in its current condition, train control has caused an increasing number of delays to Muni's rail service due to daily communication failures, train timeouts and component failures.' PDF; could not be rendered by the review tooling, sentence verified through the search index of the same document.
↗ Market Street Railway — Forty frustrating years underground (independent, transit-history nonprofit)The account of the launch: 'The first day of the new ATCS system and full use of the Muni Metro turnback, in 1998, was a spectacular and total failure, dubbed the Muni Metro Meltdown by the press. Subway service gridlocked, leaving passengers to force open doors in mid-tunnel to escape.' Also the context — a new moving-block system introduced alongside an incomplete Breda fleet replacement. The exact day is not settled: community posts give 24 August 1998, no press original was reachable, so the entry says 1998 and nothing finer.
↗ Wikipedia — Muni Metro (tertiary, corroboration only)Corroborates the season and the failure modes only: the 'Muni meltdown' of 'the summer of 1998', with the system 'sending trains down the wrong tracks, and, more often, inappropriately applying emergency braking', and the San Francisco Chronicle stunt in which a reporter on foot beat a reporter riding the subway across downtown. Not relied on for any number.
↗ Railway Gazette — SelTrac CBTC to control street-running trams as Muni resignalling agreed (trade press)Independent confirmation of the replacement scope and sequence: first phase puts CBTC on street-running track for the first time, on the Embarcadero and Third Street corridors; tunnel fit-out 2027-28; programme completion 2034. Also identifies the continuity — the replacement is a later generation of the same SelTrac family, originally Alcatel's inductive-loop moving-block product and now owned by Hitachi Rail. Note the framing limit: Vancouver's SkyTrain has run the same SelTrac lineage since 1985, so no 'oldest in North America' claim is made.
↗ Railway-News, 2025 (trade press)Carries the capacity target as a projection — capacity gains of 'up to 20 percent' across the 71-mile network — plus 'Passenger services using the new system are currently expected to begin between 2028 and 2034' and the WSP / PGH Wong programme-management joint venture.
↗ Hitachi Rail press release, 13 February 2025 (vendor)Vendor confirmation of scope: SelTrac CBTC across the 71-mile, 33-station network, a single system covering both subway and surface, with a ten-year service support agreement and an option for ten more. Vendor material — used only for scope, not for benefits.
↗ City and County of San Francisco — $130 million state grant for Muni train control (authority)Funding source: a US$130M grant from California's Transit and Intercity Rail Capital Program for Phase 2, following a US$30M TIRCP grant for Phase 1 in July 2022, against a stated total of about US$700M for all seven phases. The page returned an empty body to the review tooling; the figures were verified through the search index of the same page.
↗ SFMTA — Approved Budget FY 2026-27 and FY 2027-28 (authority)The budget-crisis counterweight, and the distinction that matters: the crisis is on the operating side. SFMTA faced a US$307M shortfall in the year beginning 1 July 2026, closed with a US$200M state loan routed through the Metropolitan Transportation Commission; the board adopted a balanced two-year budget on 21 April 2026. No source found says the capital train-control programme has been cut or deferred because of it — and none found confirms that the later phases are fully committed either.
📎 Cite this project
1001 Smart Cities (2026). “Muni Metro Advanced Train Control System & Its Replacement” — San Francisco, United States. The Smart City Atlas. https://1001smartcities.org/projects/sf-muni-metro-atcs/ (last verified 2026-07-26). Data: CC BY 4.0.
The underlying data is free to reuse with attribution — see the open data page.
🔗 Related projects
🇺🇸 MTA Subway Communications-Based Train Control · New York City
Two old subways swapping signals decade by decade: New York started in 2009, San Francisco signed Hitachi in 2025 for work due by 2034.
🇮🇳 Namma Metro Yellow Line: A Finished Line Waiting for Its Trains · Bengaluru
Bengaluru's line is rated to run unattended and keeps a driver; Muni's operator hands the train over only at the tunnel portal.
🇯🇵 Nanko Port Town Line (New Tram) Driverless Guideway · Osaka
Osaka took its crews off in 1991, put them back after the 1993 runaway, took them off again in 2000; Muni's operator never left.
🇺🇸 Green Line Train Protection System · Boston
Boston's Green Line is the step before this one: no automation at all, with the first overspeed alarms not due until 2026.
→ Open this project in the interactive atlas · → 🚲 Mobility category · 🚩 Report an error