Traction wheel

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Related to Traction wheel: Wheel slip
1.(Mach.) A locomotive driving wheel which acts by friction adhesion to a smooth track.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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(3) The relative sliding between the traction wheel and the wire rope is neglected.
A locomotive starting to move a train may encounter traction wheel slippage, which causes a characteristic scuffing mark on the track called a rail burn, as shown above.