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

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 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

Great Northern Diesel Locomotive 229 at Schenectady, New York on undated. The photograph shows an Alco Type RS-3, Great Northern Class RS-5 on public display in a park. The locomotive is painted in the original green and orange scheme. Other subject classes: Locomotive-Diesel

Great Northern Diesel Locomotive 229 at Schenectady, New York on undated. The photograph shows an Alco Type RS-3, Great Northern Class RS-5 on public display in a park. The locomotive is painted in the original green and orange scheme. Other subject classes: Locomotive-Diesel

Great Northern Diesel Locomotive 229 at Schenectady, New York on undated. The photograph shows an Alco Type RS-3, Great Northern Class RS-5 on public display in a park. The locomotive is painted in the original green and orange scheme. Other subject classes: Locomotive-Diesel

Great Northern Diesel Locomotive 229 at Schenectady, New York on undated. The photograph shows an Alco Type RS-3, Great Northern Class RS-5 on public display in a park. The locomotive is painted in the original green and orange scheme. Other subject classes: Locomotive-Diesel

Great Northern Diesel Locomotive 229 at Schenectady, New York on undated. The photograph shows an Alco Type RS-3, Great Northern Class RS-5 on public display in a park. The locomotive is painted in the original green and orange scheme. Other subject classes: Locomotive-Diesel

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