It was adapted from the novel of the same name by Phyllis Bottome.
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The crash occurred after the 10:32 Great Western Trains passenger train from Swansea to London Paddington, worked by power cars 43173 + 43163 and operating with a defective Automatic Warning System (AWS), passed a red (danger) signal (SPAD), preceded by two cautionary signals, and collided with a freight train entering Southall goods yard shortly before 13:20 local time.