Subway service on the 1, 2, and 3 train lines in Manhattan was fully restored on Sunday after a collision between two trains left 26 people injured.
The collision and subsequent derailment occurred when a train carrying passengers collided with an out-of-service train near 96th Street on the Upper West Side.
Both the Metropolitan Transportation Authority and the National Transportation Safety Board are investigating the crash, which appears to have been caused by human error.