Commuters traveling from the East Bay to San Francisco got a shock this morning when the BART train they were traveling on split in two.

A nine-car train bound from Pittsburg to the San Francisco International Airport was about to pull into the Embarcadero station around 6:23 am when one section become uncoupled from another. A fail-safe mechanism stopped the train cars immediately.

The driver was able to pull one five-car segment into the station so passengers could disembark, but the riders in the other four-car segment had to wait 15 minutes in the dark before a driver could be sent to steer the car.

The Westbound commute was delayed until about 8:30, when both car segments were off the tracks. BART is investigating the cause of the incident.

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Frances Dinkelspiel, Berkeleyside and CItyside co-founder, is a journalist and author. Her first book, Towers of Gold: How One Jewish Immigrant Named Isaias Hellman...