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public transport provided by a line of railway cars coupled together and drawn by a locomotive: "express trains don't stop at Princeton Junction"
a sequentially ordered set of things or events or ideas in which each successive member is related to the preceding: "a string of islands"
a procession (of wagons or mules or camels) traveling together in single file: "we were part of a caravan of almost a thousand camels"
a series of consequences wrought by an event: "it led to a train of disasters"
piece of cloth forming the long back section of a gown that is drawn along the floor: "the bride's train was carried by her two young nephews"
wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed: "the fool got his tie caught in the geartrain"
verb
create by training and teaching: "The old master is training world-class violinists"
undergo training or instruction in preparation for a particular role, function, or profession: "She is training to be a teacher"
train by instruction and practice: especially to teach self-control
prepare (someone) for a future role or function: "He is grooming his son to become his successor"
train to be discriminative in taste or judgment: "Cultivate your musical taste"
aim or direct at: as of blows, weapons, or objects such as photographic equipment
teach and supervise (someone): act as a trainer or coach (to), as in sports
exercise in order to prepare for an event or competition: "She is training for the Olympics"
train to grow in a certain way by tying and pruning it: "train the vine"