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This part is made from photos and an MRR drawing of a USRA 0-8-0. It was designed so that the main driving wheel could be changed from a square turn of the century counterweight to a modern crescent counterweight driver. The purpose of changing the design is to help create a modern prototype out of a design from the turn of the century. By changing it into a USRA Switcher from a candian prototype, a world of opportunity and different prototypes open up.