Emergency brake failed to stop Chicago train

CHICAGO – An emergency track-side braking system activated but failed to stop a Chicago commuter train from jumping the tracks and barreling to the top of an escalator at O’Hare International Airport, a federal investigator said Tuesday.

The events that led to Monday’s accident, which occurred around 3 a.m. and injured more than 30 passengers, might have begun with the train operator dozing off toward the end of her shift, according the union representing transit workers. But Tuesday’s announcement that a piece of emergency safety equipment might have failed was the first indication the accident could have been caused by human error and mechanical failure.

Read the complete story at the Associated Press.