  The surface roughness between the wheel and rail has a huge influence on
rolling noise level. The presence of the third body such as frost or grease at
wheel-rail interface contributes towards change in adhesion coefficient
resulting in the generation of noise at various levels. Therefore, it is
possible to estimate adhesion conditions between the wheel and rail from the
analysis of noise patterns originating from wheel-rail interaction. In this
study, a new approach to estimate adhesion condition is proposed which takes
rolling noise as input.
