The MTH 20-3089-1 Union Pacific Challenger #3713 with Proto 2 (Wrong Tender) is a highly detailed model steam locomotive in 1:48 scale. It features a black color scheme, plastic and diecast construction, and realistic smoke, light, and sound functions. With a digital control system and MTH DCS technology, this ready-to-go locomotive is perfect for O gauge model railroad enthusiasts who want to experience the thrill of the Union Pacific Railroad.