For sharp curves, lubrications like painting oil have generally been used to decrease the friction of coefficient between wheel and rail. In this study, a surface modification technology was developed to control friction and wear. The stresses in wheel and rail were analysed by FEM to clarify contact stresses upon wheel climbing. Stresses were also analysed in considering the roughness of wheel matrix to estimate the durability of coating film. Based on the stress analyses, some types of composite coating films were developed to improve coating adhesion, and their characteristics of traction coefficient and anti-wear were estimated. The MoS2 composite coating showed a low friction of 0.06. This implies the possibility of preventing wheel climbing in dry environment. As a result, it was proved that Nitrided-treatment decreased the wear amount to one-third.

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