He is always a dutiful person, so will not go off the rails.
他向来是个守本分的人，不会做出越轨之事。
A sane healthy mind can get momentarily off the rails.
正常健全的头脑也会一时失常。
He is a very reliable person he has never gone off the rails.
他这人十分可靠，从来不越轨逾矩。
Suddenly there was a terrible noise, and the train came off the rails.
突然响起一阵可怕的声音，火车出了轨。
Suddenly there was a terrible noise, and the train came off the rails.
突然响起一阵可怕的声音，火车出了轨。
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