Builder's photo of Colorado Midland steam locomotive number 23, built for passenger service at Schenectady Locomotive Works in Schenectady, New York, in 1887. Photo from J.M. Fredrickson Collection. Other Subject Classes: steam locomotive, builder's photo

Northern Pacific steam locomotive 3 at Schenectady, New York, in 1897. The builder's photo of Number 3, (later number 13), a class X, was built by Schenectady as a compound for helper service in 1897. Photo by Schenectady Loco. Works, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, builder's photo

Northern Pacific steam locomotive 4008 posed for a builder's photo in April 1913. Number 4008 is a class Z-3 built by Alco-Schenectady in 1913. Photo by Alco-Schenectady, J.M. Fredrickson collection. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 5100 at Schenectady, New York in 1936. Number 5100 is a class Z-6 built by Alco-Schenectady in 1936. Photo by AH Fiedler, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo