This course assesses both the theoretical and the practical aspects having to do with wheel rail interface. The course starts with everyday observations in the railway system that clarify what wheel-rail interface is and why it is so important. Additionally, we will take a look at the scientific governing rules behind these observations. After having obtained sufficient background knowledge, we carry out computer exercises to apply the theories to engineering practice and explain what is happening in real life. Next to the standard lectures, two guest speakers will be invited. One of them will talk about the industrial needs as to wheel-rail interface, and one of them will discuss the advances in scientific research in this area.