Abstract: A rail grinding machine especially designed for grinding railroad track rails at railroad track switches and road crossings. The grinding machine includes an articulated grinding module supporting undercarriage suspended from the grinding machine main frame. The undercarriage includes a unique suspension system that allows for lateral shifting and pivoting of the undercarriage independently of the grinding machine main frame. Grinding operations are controlled by sensing the supply pressure of the constant flow hydraulic fluid used to power the individual grinding modules, and positioning the grinding modules in grinding abutment with the rails as a function of the supply pressure.

Abstract: A trench digger for digging and maintaining drainage ditches along railway road beds. The trench digger includes a compact rotary drum cutting head mounted on a boom that can be swung about a boom base pivot axis to position the cutting head to either side of a railroad mounted support carriage. A first conveyor carries loosened composite from the cutting head to a first conveyor discharge point rearwardly of the boom base pivot axis. A second conveyor, pivotally mounted to the boom base at a second conveyor pivot axis oriented rearwardly of the boom base pivot axis, receives the loosened composite from the first conveyor and conveys the loosened composite to a second conveyor discharge point remote from the boom base.