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 2017[update], there are approximately 1,051,767.605 kilometres (653,538.091 mi) of railway track in use worldwide. (World Bank)
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