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The RGH20C is the latest Harsco Rail rail grinder. It is designed to grind the top and sides of both running rails in mainline, crossings and switches. The C-model is modular and available in various combinations of self-contained 10 and 20 stone units, which can be connected together to form a larger consist of up to four units. In any configuration, a single operator can control the entire machine. The machines are also available at any gauge between 1067-millimeter (42-inch) and 1676-millimeter (66-inch); there's also a variable gauge model. The machines are available with two axles per car or with two bogies per car, depending on individual customer needs for axle loads and curve negotiation. Each machine is equipped with an integral dust collector to evacuate the enclosure around the grinding units. The dust collector is designed to remove 99.99 percent of the airborne particles greater than 0.5 microns from the air that is drawn into the collector. Units are also available on a contract basis.