Great Northern Diesel Locomotive 429 at Denver, Colorado on undated. The photograph shows an Electro-Motive Division Type F-45, Great Northern Class F-45. The locomotive is painted in the Big Sky Blue scheme. Visible in the background is a sand tower. Other subject classes: Locomotive-Diesel, Tower-Sand

Great Northern Diesel Locomotive 414A/D at Denver, Colorado, September 1959, original orange/green paint scheme. Other subject classes: Locomotive

Great Northern Diesel Locomotive 401 at Denver, Colorado, October 1971, simplified orange/green paint scheme (as Burlington Northern 6431). Other subject classes: Locomotive

Great Northern Diesel Locomotive 400 at Denver, Colorado, May 24, 1972, simplified orange/green paint scheme (as Burlington Northern 6430). Other subject classes: Locomotive

Great Northern Diesel Locomotive 3034 at Denver, Colorado, March 17, 1970, simplified orange/green paint scheme. Other subject classes: Locomotive

Great Northern Diesel Locomotive 3034 at Denver, Colorado, March 17, 1970, simplified orange/green paint scheme. Other subject classes: Locomotive

Great Northern Diesel Locomotive 3034 at Denver, Colorado, March 17, 1970, simplified orange/green paint scheme. Other subject classes: Locomotive

Great Northern Diesel Locomotive 3010 at Denver, Colorado, May 1970, simplified orange/green paint scheme . Other subject classes: Locomotive

Great Northern Diesel Locomotive 2527 at Denver, Colorado on April 4, 1970. The photograph shows a GE Type U28B, Great Northern Class U28B. The locomotive is painted in the Big Sky Blue scheme. Other subject classes: Locomotive-Diesel

Great Northern Diesel Locomotive 2513 at Denver, Colorado, May 3, 1970, simplified orange/green paint scheme. Other subject classes: Locomotive