The investigation into the CTA train crash and derailment at O’Hare has prompted a review of emergency braking situations nationwide.
Dozens of people were injured in march when a Blue Line train jumped the tracks and plowed into an escalator, after the operator fell asleep.
Investigators said an automated braking system activated, but there was not enough room for the train to stop.
Now, the federal transit administration is calling on all U.S. Rail Transit systems to check stations for the same problem.
They are also being urged to test automatic signals.