CHICAGO (AP) — 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.
National Transportation Safety Board investigator Ted Turpin said a preliminary review showed the train was traveling at the correct speed of 25 mph as it entered the station. Investigators said they have not yet determined whether the operator ever applied the in-cab brake.
Turpin, who is in charge of the investigation, said an automatic emergency braking system located on the tracks was activated but failed to stop the train as it burst onto the platform.
"It activated," Turpin said of the emergency system. "That's all we know factually. Now, whether it did it in time or not, that's an analysis that we have to figure out."
A team from the NTSB was also exploring how rested the train operator was before starting her shift and whether rules governing overtime had been violated, after a union official suggested she might have dozed off.
They planned to interview the train operator Tuesday afternoon.
"We're going to ask probably the operator how they felt ... because we always take into consideration the fatigue factor. It's one of the things we do investigate," Turpin said.
The operator, whom officials have not identified, was off duty for about 17 hours before starting work around 8 p.m. Sunday but had recently put in a lot of overtime, Amalgamated Transit Union Local 308 President Robert Kelly said Monday.
"I know she works a lot — as a lot of our members do," he said. "They gotta earn a living. ... She was extremely tired."
Kelly said the operator took standard drug and alcohol tests after the derailment and that she assured him they were not an issue.
Continue reading this story on the...