Narrow welded track (commonly known as narrow welded pressure rail) is mainly used with the level of wheel crane rail fixed after the installation height should be ≤ 71mm. Selected according to the different types of rail track of the corresponding models fixed, fixed interval distance of the crane lifting capacity to determine, from the weight ≤ 275T of cranes, fixed pieces of the layout spacing of 600mm from the weight of ≥ 275T cable car, fixed layout spacing should be 500mm.