The Bryn Athyn train wreck occurred on December 5, 1921, when a head-on collision occurred on a single line of track near Bryn Athyn station in Pennsylvania, United States.

Before leaving the station, the engineers would be given written orders in regards to the expected rail traffic.

154 had passed, despite the block signal being down, meaning the train was supposed to remain stopped.

[2] At 7:55 am, Trains 151 and 156 collided about half a mile from the Bryn Athyn station.

In total, 27 persons were killed in the wreck, including the firemen of the two trains.