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))
Image 39A hump classification type of yard. The camera is positioned near where cars are decoupled and begin to accelerate downhill past a scale. The speed regulation (retarder brakes and speed sensors) devices shown in the foreground adjust the car speed for the calculated soft-coupling on arrival along the sorting track for the consist it is being routed to join. (from Rail yard)
Image 40This map of Cedar Hill Yard in Connecticut shows a variety of different facilities, including receiving yards, departure yards, classification yards, and a repair yard. (from Rail yard)
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