Out-of-service commuter train accident near Philly hurts 4

In this image from video provided by WPVI, officials investigate an accident involving out-of-service commuter trains in Upper Darby, Pa., Tuesday, Feb. 21, 2017. The Southeastern Pennsylvania Transportation Authority said the Market-Frankford Line trains were traveling near the 69th Street Transportation Center when the accident occurred. (WPVI via AP)

PHILADELPHIA (AP) — Officials are investigating an accident involving three out-of-service commuter trains in suburban Philadelphia that injured four people, including a train operator hospitalized in critical condition.

The Southeastern Pennsylvania Transportation Authority says the Market-Frankford Line trains were traveling near the 69th Street Transportation Center when the accident occurred Tuesday morning.

SEPTA spokesman Andrew Busch says one train rear-ended another on a loop where trains turn around to get back into service. Cars from that accident derailed and hit a third train on nearby tracks.

He says it’s unclear why the passengers were on the out-of-service train. The cause of the accident is under investigation.

Shuttle buses are running between the 69th Street Transportation Center and the 63rd Street Station.

Busch says the second train operator has received medical treatment but he’s unsure of the passengers’ conditions.