F-150 Complex track is based on the L-shaped complex rail derived, by lifting and drop to and from the top of the lift cylinder to achieve an increase or decrease of the pad, but the use of time during the operation will be longer. F-150-type complex rail jacking point of the beam, lifting cylinder for the three hydraulic cylinders, maximum lateral displacement of 500mm, the lowest operating point is 400mm, maximum lift 800mm, jacking beams vehicle weight applies to 150 ton to 350 tons, jacking beams. Locomotive maintenance system suitable for large-scale road maintenance machinery vehicles molten iron and steel enterprises and other rescue vehicles from the complex job.