Train of Events

Train of Events is a 1949 British portmanteau film made by Ealing Studios and directed by Sidney Cole, Charles Crichton and Basil Dearden. It tells the story about a train that crashes into a stalled petrol tanker at a level grade crossing, and then flashes back and tells four different stories about some of the passengers before the crash.

After dark, the train is still travelling north at speed when a light being waved by the trackside is seen by the driver. He applies the brakes, but a road tanker stalled across a level crossing is looming up just ahead. Plainly, there is not enough room to stop. Just as the collision is about to occur there is a fade out, which is succeeded by a general view of the railway locomotive sheds at Euston, three days earlier.Several personal stories are then told in a series of flashbacks which make up the train of events referred to in the title. ........

Source: Wikipedia