The Caterpillar D5M and D5N models operate at 121 horsepower and are the perfect dozer for track renewals and S&C projects. They are available with Trimble laser equipment to give accurate formations or available with 3 dimensional GPS/ ATS systems where the data is constantly changing as the machine travels. This allows the machines to grade fomations that require the elevation and/or the crossfall to change along the axis that the machines travel. Most highway and motorway projects use this technology these days.
The railway requires the formation to be graded in confined areas in stations, alongside structures or adjacent to open lines where the D5 XL models offer the optimum size machine for the width of the operating area.