AN eight-car Chicago commuter train has ploughed across a platform and scaled an escalator at an underground station at O'Hare airport, injuring 32 people.
No one suffered life-threatening injuries in the Blue Line derailment, Chicago Fire Commissioner Jose Santiago said during a Monday morning briefing.
Chicago Transit Authority investigators along with the city fire department and police were reviewing security footage and interviewing the driver and other CTA workers to pin down the cause of the accident.
Steele said crews were working to remove the train and fix the escalator and aren't sure when the station will reopen.
The train appeared to have been going too fast as it approached the end-of-line station and didn't stop at a bumping post - a metal shock absorber at the end of the tracks.
"The train actually climbed over the last stop, jumped up on the footpath and then went up the stairs and escalator," Santiago said.
"Apparently (it) was travelling at a rate of speed that clearly was higher than a normal train would be," Steele said.
It wasn't clear how many people were on board at the time but the accident happened during what is "typically among our lowest ridership time," Steele said.