The problems of how to raise tractiveforce of heavy haul trains are comprehensively discussed, particularly from the viewpoint of wheel-rail adhesion.
本文着重从轮轨粘着方面，对怎样提高重载列车牵引力问题作了综合探讨。
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And the bogie is one of the major components of a vehicle, it transfer every kind of forces, and produce tractiveforce using adhesion force between wheel and rail.