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This is a new body to turn the 1970's Atlas O scale Plymouth WDT switcher into a critter. This body is generic inasmuch as it could be diesel, electric (with an added pantograph), gas-mechanical, trolley (with a trolley pole), or even a steam dummy. The model has no printed-on details (lights, bells, horns/whistles, etc.) to allow the modeler to add the details to make the critter into what ever he wants. This body fits on the chassis "backwards" to allow the ladders cast into the frame to align with the doors on the new body (look at the pictures, you'll see what I mean). The Atlas body and air tank will have to be removed to mount this new body.