The special vehicle type P 90 LS by Matis is part of a track-laying train used for track renewal based on continuous track re-laying. Such a solution is dictated by the need to obtain both high quality and high efficiency of the works performed. The vehicle consists of two main, interconnected parts: WM – this part includes an energy supply unit and a set of pliers for setting the c/c spacing of rails, WF – this part consists of the assembly for laying and collecting sleepers (new and old) and conveyor belts for lifting sleepers.