Atlas N Scale Locomotive Cab Rooftop Air Conditioner kits are great for adding fine detail to your diesels. This easy-to-build kit features unpainted etched-metal parts you can simply fold together with fine pliers. Cement the parts using CA glue. Vents and louvers are engraved in the parts. Locomotive Cab Rooftop Air Conditioners are part of the line of Atlas N Scale super-detailing parts.