CTA has attributed the nearly two-month closure to testing the agency was conducting on the line and a desire to have National Transportation Safety Board investigators return to Chicago for a second visit, as questions lingered about the factors contributing to the crash and whether it could have been prevented.
On Nov. 16, a Yellow Line train was approaching the Howard station, near the border of Chicago and Evanston, when it rear-ended a "snow-fighter" track-plowing train that was on the tracks for scheduled training. At least 16 people were taken to hospitals after the crash, three of them critically injured, according to a preliminary NTSB report.
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