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In rail transport, a train is a vehicle or (more frequently) a string of vehicles capable of being moved along a continuous line of rails or other guideway for the purpose of conveying freight or passengers between points on a predetermined route. The train may be hauled or propelled by one or more vehicles designed exclusively for that purpose ( locomotives) or may be driven by a number of motors incorporated in all or several of the vehicles ( multiple units).

As of 2018 ^[update], there are approximately 1,052,000 kilometres (654,000 mi) of railway track in use worldwide. ( World Bank (via Archive.org) ^[1])