As a noun, it is a connected series of vehicles that run on rails to carry people or goods. As a verb, it means to teach or practice skills so that someone or something can do a job well.
It comes from Old French 'traine', meaning 'a trailing part', from 'trainer' meaning 'to pull' or 'drag', from Latin 'trahere'. The teaching sense comes from the idea of 'drawing out' or 'guiding' someone’s abilities.
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