IPA: /dɪˈtreɪn/
KK: /dɪˈtreɪn/
To leave a train or to make someone leave a train.
Passengers will detrain at the next station.
Past: detrained
Past Participle: detrained
Detrain is formed from "de-" (meaning down or away) and "train" (from Old French *trahiner*, meaning to pull or drag). The word describes the action of getting down or away from a train, specifically disembarking from it.
Think of 'getting down' or 'away' ('de-') from a 'train' — that's what detrain means.