Directed by Castleton Knight, the thriller is chiefly remembered for being the first acting role of Ray Milland, as well as for its daring stunts performed aboard the moving train.

Meanwhile, the fireman's amorous young replacement has fallen in love with a beautiful girl, whose father, unbeknown to him, happens to be Bob (and who has also boarded the train in an attempt to stop the villain).

[1] Milland, then appearing under his birth name of Alfred Jones, was spotted by director Castleton Knight while he was working as an extra on The Informer which was being shot on a neighbouring stage.

Most dangerously, at one point actress Pauline Johnson walks along the edge of the moving train wearing high heeled shoes, transferring from the coaches to the locomotive while travelling at speed.

As a result, early scenes feature speech captions and music instead of recorded voices, with character dialogue only appearing towards the end of the film.