To get off or unload from a train; the opposite of boarding a train.
From de- (prefix meaning 'off' or 'away') + train (the vehicle). Formed in the early 1800s as a practical term for military and civilian transportation, mirroring the earlier verb 'entrain' (to board a train).
Detrain is primarily a military and railroad term that ordinary people rarely use in conversation—you're more likely to hear 'get off the train'—but it's still standard terminology in transportation, military operations, and historical texts.
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