This is a O Scale 2 rail Monon Phase 1 F3 A unit that is plastic. This engine has metal grab irons, die cast chassis and trucks, die cast scale fuel tanks, twin fly wheel equipped motors, directional LED lighting, close coupling between units and is highly detailed. The DCC features Lok Sounds . Minimum radius track is 36″. We also have a power B unit (sold separately) item # 30126004. The engine is made by Atlas Model Railroad Co. in 2019.