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This N-scale project, in development, are replacement sides, designed to fit the Atlas USRA Double Sheathed Boxcar (#45700). Using a razor saw, carefully cut out the stock sides, from just behind the cast Dreadnaught ends, and epoxy in the new sides. This set also includes the end doors. You'll need to cut openings in the Dreadnaught ends, and epoxy the door in place. You'll also need to ad grab irons, and rungs at the corners and under the side doors. The sides were designed on their ends, to allow the printing process to create a vertical grooved appearance on the surface of the sides.