Atlas introduces the Kato-made ALCO RSD-12 in 1986. The first offering of Atlas RSD-12 models included four roadnames (C&O; NKP; PRR; SP) and an Undecorated example. The 1986 retail was $49.95. A review of the Atlas RSD-12 is found in the August 1986 edition of Model Railroader magazine. The review says, "Once again Atlas has come up with a superb Alco road switcher that fills a gap in the units available to modelers." The review mentions the RSD-12 is a combination of the prior released RS-11 and RSD-4/5. The body shell comes from the RS-11 and the trucks and frame belong to the RSD-4/5. This makes for a close, but not completely correct RSD-12. The reviewer states the location of the air filters on the long hood and the brake cylinders on the trucks are not exact matches to the RSD-12.