The friction coefficient in the calculation of surface traction between wheel and rail is often considered to be constant. However, the true friction coefficient starts to fall as passing from adhesion area to slip area. Inclusion of such behaviour in the estimation of tractions on the contact patch can make the calculations more accurate. In the presented work, the slip dependent coefficient of friction is implemented in the tangential contact solution by using ‘Friction Memory’ concept [1] and the effect of such consideration on the prediction of wear and rolling contact fatigue (RCF) is analysed. Furthermore, an on-set curve squeal noise detection technique has been proposed.