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This is a new cab to turn the 1970's Atlas O scale WDT switcher into a Fn2 critter. The original cab is cut off of the Atlas body and this new cab fits in place and snaps onto the attachment points left on the chassis. There is only one printed-on detail, a backup light which can be drilled out for a 3mm LED; this keeps the cost down and to allows the modeler to customize the final model. "F" scale is 1/20.3 and at that scale, O gauge track is 25 inches (close enough to 2 foot for this modeler).