This detailed Atlas Classic Silver Alco RSD4/5 locomotive is based on one of the most popular Alco road switchers. The model features applied handrails, grab irons and other details. This HO Scale diesel comes equipped with an 8-pin socket for easy decoder installation when you're ready. The Alco RSD4/5 features a five-pole skewed-armature motor with dual flywheels, directional LED lighting and AccuMate(R) magnetic knuckle couplers.