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rail car mover
A railcar mover is a road-rail vehicle (capable of travelling on both roads and rail tracks) fitted with couplers for moving small numbers of railroad cars around in a rail siding or small yard. They are extensively used by railroad customers because they are cheaper than owning a switcher locomotive, more convenient and cheaper than paying the railroad operator to do the switching, easier and more productive than manual moving of cars, and in addition they are more versatile since they can travel on road wheels to the cars they need to move, instead of needing clear track.
==Drive systems==
Some have two drive systems and drive only on steel wheels on the rail, with their rubber tires lifted out of the way, while others have only one drive system and use steel rail wheels only to guide them and use their rubber tires on the rail, in a similar fashion to HiRail trucks. These systems have a higher tendency to derail while pulling loads and in curves.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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