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From Vikidia, the encyclopedia for 8 to 13-year-old children that everybody can make better
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A subway is a train that goes usely underground.It's used to go around the city quikly. Unlike trams and buses subway trains have no trafic to slow them down.Also it does not have overheaed wires but a metallic poll next to the track that gives electrisyty to the subway. We also call it the Metro.