It is mainly used in railway line construction, and has the functions of pillow replacement, square pillow, ballasting, excavation, tamping, trimming and lifting. With the dual-purpose running mechanism of highway and railway, the running speed is fast and the power is high, which is suitable for construction under various working conditions, especially for the working environment that requires long-distance back-and-forth operation, such as demolishing old stations and yards, changing sleepers in long bridges and tunnels, etc. Including pillow changer