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Based on Caterpillar D4H, D5M, D3G and Komatsu D41P-6.

The Rexquote road rail bogie enables the user to travel a laser dozer to an excavation site without the use of a train or a flat roll. This is done by a hydraulically driven bogie which is powered by auxiliary hydraulics on the rear of the machine. A detachable pony truck underneath the front blade is removed, and the rear bogie is retracted hydraulically to facilitate normal working.