O'Hare Blue Line derailment.

Longer rest periods, more limits on how long an operator can be on duty, and a 15mph speed limit slapped onto trains entering O'hare terminal are among
CTA's response to the accident.

I wonder how far back from the original location the trip stop was moved...

A previous Chicago Tribune article said CTA moved the trip to 61 feet from the end of track, so whatever it was before was probably less than a car length.