PLEASANT HILL -- Following Tuesday's nightmarish evening commute on the Pittsburg-Bay Point line, BART trains resumed normal service Wednesday morning for about 5¿1/2 hours.

Then came a glitch on the same line, though not as severe as the one Tuesday night that stranded hundreds of commuters.

A malfunctioning brake on a car stopped a train heading from Pittsburg-Bay Point to the San Francisco International Airport in the Transbay Tube just after 9:30 a.m. Wednesday, causing a 20-minute delay, BART spokesman Jim Allison said. The issue resolved itself quickly, with the car taken out of service in Daly City. Delays were only five minutes systemwide by 10 a.m.

The delay barely created a ripple compared with Tuesday evening's fiasco, when a portion of track and third rail became damaged north of the Pleasant Hill station. BART officials closed the track between the Concord and Walnut Creek stations in both directions around 5:10 p.m., leaving hundreds of commuters looking for other ways to get home.

BART spokesman Alicia Trost said Wednesday morning that investigators had found a flange on the tracks and that the damage occurred at an interlock in the tracks, where a set of switches can transfer trains from one track to another.

A flange is a part of the train's wheel that keeps it attached to an axle.

Trost said the damage to the track was "extensive" and that the agency is conducting a "complete, diagnostic investigation."


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With the interlock damaged, trains moving east toward Bay Point were forced initially to turn around at the Walnut Creek station, while westbound trains stopped at Concord. By 8:15 p.m. Tuesday, trains were able to single-track through the stations, but the residual effect delayed trains for about 20 minutes until the end of service Tuesday night, Trost said.

Full service on the Pittsburg-Bay Point line resumed at 4:02 a.m. and continued without a hitch until the delay in the tube, the first delay reported on the system's 52 lines Wednesday.

Contact Rick Hurd at 925-945-4789. Follow him at Twitter.com/3rderh.