Everything appeared in order as the train passed through
North Philadelphia station ahead of schedule and slowed its speed, but shortly afterward, as it passed a rail yard, workers noticed flames coming from a
journal box (a
hot box) on one of the cars and rang the next signal tower at Frankford Junction, but the call came too late. Before the tower man could react, disaster struck as the train passed his signal tower at 6:06 pm traveling at a speed of 56 mph. The journal box on the front of car No. 7 seized and an axle snapped, catching the underside of the
truck and catapulting the car upwards. It struck a
signal gantry, which peeled off its roof along the line of windows "like a can of sardines". Car No. 8 wrapped itself around the gantry upright in a figure U. The next six cars were scattered at odd angles over the tracks, and the last two cars remained undamaged, with bodies of the 79 dead lying scattered over the tracks. As it was wartime, many servicemen home on leave were aboard who helped the injured. Workers from the nearby
Cramp's shipyard arrived with
acetylene torches to cut open cars to rescue the injured, a process that took until the following morning. The rescue work was directed by Mayor
Bernard Samuel. The work of removing the dead was not complete until 24 hours after the accident. Among the survivors was Chinese author
Lin Yutang. ==Inquiry==