Track vehicles are often encountered in the area of railway operations. They are rather inconspicuous in comparison to fast or colourful or heavy trains, but excel in railway related tasks on or along the track with a high degree of power, flexibility and economic efficiency. They play a considerable role in the maintenance of the infrastructure. For a long time already have these special vehicles been more than a compact means of transport for people and material. Modern track vehicles have entered new dimensions in the last ten years with a wide variety of functions and by taking on tasks of shunting and transit traffic at work sites. Further potential is unlocked step by step. Track vehicles are not only used on main and branch lines, but also in urban traffic.