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This is a USRA 0-8-0 switcher style sand dome. It has been drawn to 3/4" scale. The sand hatch holes exist so that the it can be turned into part of the lubricator and create a larger reservoir. 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.