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Wheel slide protection
Wheel slide protection and wheel slip protection are railway terms used to describe automatic systems used to detect and prevent wheel-slide during braking or wheel-slip during acceleration. This is analogous to ABS and traction control systems used on motor vehicles. It is particularly important in slippery rail conditions.
==Sanding==
Sanding is one method of reducing wheel slide. Locomotives have sandboxes which can deliver sand or Sandite to the rails in front of the wheels. In modern diesel locomotives there is a button that the driver will press to start sanding. This button is tied to a computer system that determines the train's direction and where the sand should be applied: either forward or aft of the trucks. In older locomotives, though, there was a manual lever attached to a valve that had three positions: Off, Forward, and Aft. The engineer could flip this lever to dump sand in correspondence with the train's movement.
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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