Wheel slide, reflecting a trio of factors, led to the collision between a Chicago Transit Authority Yellow Line train and a ...

CTA’s signal system and the train cars involved in the crash — two, decade-old 5000-series cars, which is CTA’s most common railcar model — and simulated tests involving that type of train.

CHICAGO (CBS) -- Nearly 500,000 people ride Chicago Transit Authority 'L' trains every day. "It's very convenient, efficient, cost-effective for sure," said Adrian Vasquez. The CTA also advertises ...