Detailed Description:
D&RGW S2 101 at Alamosa, Colorado on August 17, 1965, Kodachrome by Chuck Zeiler. Built by Alco in September 1941 (c/n 69555), this particular locomotive was equipped with dual couplers on the rear, one offset and lower, for switching narrow gauge cars around the yard in Alamosa. The front had a unique sliding coupler that could be adjusted offset up or down with the aid of a power mechanism to accommodate either gauge. Electro-Motive SW1200 131 also had dual gauge couplers installed during 1966.