Investigators face a daunting challenge to sort out the bizarre half-mile journey of an out-of-service, possibly driverless CTA "ghost train" that breached multiple safeguards before colliding with another Blue Line train Monday morning.
The accident that sent more than 30 people to hospitals was unlike any that veteran city rail workers say they have seen: A train maneuvers around the curves in the Forest Park rail yard, passes through at least two track switches — any one of which should have stopped the train — continues past the station platform, then climbs up and over a small hill near the Eisenhower Expressway before accelerating to about 20 mph and ramming the stopped train at the Harlem stop shortly before 8 a.m.
"The million-dollar question is, 'How did this happen?'" said Robert Kelly, president of the CTA rail workers union. "This is baffling everybody."
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