Full Breakdown
Bay Area Rapid Transit (BART) Service Disruptions Linked to Heat Wave and Aging Substation
By Drooid · · How we work
Heat Wave Triggers Phantom-Train Glitches
During a three-day Bay Area heat wave that pushed temperatures to a high of 93 °F, BART’s train-control system recorded “false occupancies” – computer errors that indicated a train was on a track segment when none was present. The first incident occurred at 6:23 a.m. near Daly City, with additional false occupancies reported at 9:09 a.m. and on the following morning. Operators slowed or rerouted trains to avoid potential collisions, leading to bunching and extended travel times. BART officials attribute the glitches to extreme heat stressing the signaling hardware.
Substation Fire Exposes Aging Infrastructure
A separate incident on Tuesday involved a fire at the Daly City substation. BART Assistant General Manager Sylvia Lamb said crews identified a faulty cable on an aerial structure that caused a main breaker to short, igniting equipment in a substation that is at least 40 years old. The substation was previously listed among the “top five” of the system’s 74 substations slated for replacement; roughly 70 % of the network’s substations are original installations. The fire damaged train-control equipment, prompting the suspension of Green-line service between Daly City and Berryessa on Thursday while repairs proceeded.
Official Responses from BART Leadership
Board of Directors Vice President Edward Wright apologized to riders for the “terrible experiences” over the past 48 hours, acknowledging missed flights, appointments, and work arrivals.
Impact on Riders and Service
The combined effects of heat-induced signaling errors and the substation fire forced service interruptions on multiple lines. Green-line trains were halted, Blue-line riders faced limited service between Dublin/Pleasanton and 24th Street Mission, and Peninsula commuters experienced an hour-long outage between San Bruno and Colma, affecting airport access to SFO. Riders reported extended wait times and the need to transfer between lines to complete trips.
Verbatim Quotes
- “You’re gonna have a whole bunch of trains bunched up down there,” — Sylvia Lamb, assistant general manager
- “I want to apologize to our riders, who’ve had some really terrible experiences over the last 48 hours,” — Edward Wright, BART Board Vice President
- “This is a very clear failure that is due to aging equipment,” — Sylvia Lamb, assistant general manager
