This detailed Atlas HO Scale Master Gold Alco HH600/660 is modeled after diesels built by the American Locomotive Company between 1931 and 1940. This model is based on post-1937 units. Several of these venerable workhorses are preserved in museums. This Atlas model features a five-pole, skew-wound motor with dual flywheels, directional LED lighting, Accumate(R) magnetic knuckle couplers, accurate decoration and roadname-appropriate body details. This replica comes equipped with a dual-mode ESU LokSound sound and DCC decoder for operation on DCC and DC layouts (with limited sound capabilities on in DC operation). The Alco HH600/660 is one of many Atlas HO Scale locomotives.