The Vaia Car Spark Rail type autogenous welding machine with head K335A1 is designed to weld rails directly in the track. The welding head is mounted on a truck with a wheel-rail chassis. It is possible to put the vehicle on the rails at a level crossing or by means of an auxiliary ramp. On the railway track, the machine moves independently as a rail vehicle. Transport from one construction site to another is carried out on a low-loading platform. The welding head used in this autogenous welding machine is a typical head produced at the plant in Kakhovka (Ukraine). The autogenous welding process is controlled and monitored by the on-board computer. The measuring system measures three autogenous welding parameters: distance, working pressure and electric current, all as a function of time.