Abstract:As the mixed transportation mode is often used in the existing railway lines at present,by using a LM profile of passenger and freight car wheels to match with CHN60 rail and grinding profile rail respectively,the wheel/rail contact geometry relationship was analyzed.By taking the material elastoplasticity and inertia force into consideration,a 3D wheel/rail rolling contact steadystate model was established by using mixed Lagrangian/Euler method.Based on two wear model,the wear of passenger and freight car wheels before and after the rail grinding was studied and predicted.Results show that wheel/rail contact geometry relationship is changed after the rail grinding,and the Mises stress in the passenger car wheel is decreased,while the stress is almost the same of the freight car wheel.When a rail contacts with passenger and freight car wheels separately,the wear of freight car wheel is larger than that of passenger car wheel.The rail grinding would reduce the wheel/rail contact tangential force and reduce the wear of the wheels.This is very beneficial to extend the service life of wheel/rail.