Ensuring the safety of running trains is the main condition of railways exploitation for transport of passengers and cargoes all over the world. This is determined by the growth of moving speed in railways and by the wear of the rolling stock. As the moving speed increases, the requirements of quality of railways and of the rolling stock become stricter. This entails the necessity of optimal use of rolling stock without decreasing the movement safety. In particular, in Russia, occurs the wear of car and locomotive stock. A similar situation exists in railways of India, Australia and some former socialist countries.