The rail grinding unit type AT UM3500-4E was developed to be connected to a Mercedes Unimog or a similar carrier vehicle. On top of the vehicle, the grinding unit can be transported to the construction site and serves also as a power supply unit. The unit is operated through radio control, which also controls the vehicles velocity on rails. The machine is designed for grinding corrugations, short shafts, new rails and turnout grinding. Additionally, to reprofile the transverse profile and remove road surface defects. Together with the powerful vacuum system, it is also suitable for use in subways.