Third-person singular simple present indicative form of train.(verb)
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Use "trains" in a sentence
"In addition, despite many people having long journeys on public transport, usage of computers in trains is relatively rare, perhaps partially due to the frequent lack of elbow room, let alone seats, in crowded trains!"
"Trying to parse these pseudo-English texts without any technical expertise in trains is my latest vexation."
"At one place on the route of the trains is a spot called the Battle Ground: it consists of about six acres of land, filled with holes about 2ft. square and 4ft. deep."