The wreckage was removed and most of the track damage repaired yesterday morning, but railroad officials said the cause of the Friday night collision of two Conrail freight trains east of Baltimore remained unknown.
Four Conrail crewmen from the trains were treated for minor injuries at the Francis Scott Key Medical Center after the accident, which occurred about 10:30 p.m. near Eastpoint along the Northeast Corridor tracks owned by Amtrak and used by its passenger trains.
The accident near Conrail's Bayview yard initially blocked three of the four tracks, but caused no delay as only three scheduled passenger trains passed through the site during the night.
By noon yesterday, only one track remained closed and daytime Amtrak service was reported operating on time.
Conrail spokesman Chris Mykrantz said the collision involved a train with 54 rail cars carrying highway trailers traveling from Baltimore to Harrisburg, and another with 122 loaded cars carrying coal from Harrisburg to Baltimore.
Two coal cars and four diesel locomotives were derailed, according to Bruce Heard, a spokesman for Amtrak, the national rail passenger corporation. The equipment was re-railed by noontime yesterday, he said.
The only track remaining closed leads into the Bayview train yard and is not used for passenger trains, Mr. Heard said.
The accident is being investigated by the National Transportation Safety Board, Conrail and Amtrak.