Abstract：Research purposes:75 kg/m rail with new profile (75N rail) is designed for adverse match the wheel-rail of the early stages of rail use in Datong-Qinhuangdao railway heavy line. The contact state and the geometry relation are compared and analyzed by simulation before and after optimization of 75 kg/m rail, 75N rail is tested in Datong-Qinhuangdao railway heavy line.
Research conclusions:(1) 75N rail can significantly improve the wheel-rail relationship,The wheel- rail contact position is in rail head tread center area, The wheel-rail contact stress decreases sharply; (2) Regardless of pre-grinding or not pre-grinding, the wheel- rail contact position is centered in a straight line. Gauge corner does not appear the crushing and shelling, Application of The new profile of 75N rail is in good condition; (3) When 75N rail is used in curve, gauge corner does not appear the crushing, it shows good relationship of wheel-rail contact. (4)This research results can be used in rail of heavy haul railway.
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2014, Vol. 31 
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