Great Northern Diesel Locomotive 328 at Saint Paul, Minnesota on June 1, 1968. The photograph shows an Electro-Motive Division Type SDP-45, Great Northern Class SDP-45. The locomotive is painted in the Big Sky Blue scheme. Visible in the background are switch stands with lanterns and lettering. Photograph by P.D. Custer Jr. Other subject classes: Locomotive-Diesel, Switch Stand

Great Northern Diesel Locomotive 328 at Saint Paul, Minnesota, 1968, Big Sky Blue paint scheme (leading a train). Other subject classes: Locomotive

Great Northern Diesel Locomotive 327 at Saint Paul, Minnesota on August 11, 1967. The photograph shows two locomotives. The lead locomotive is an Electro-Motive Division Type SDP-45, Great Northern Class SDP-45 painted in the Big Sky Blue scheme. Photograph by Karl Henkels. Other subject classes: Locomotive-Diesel

Great Northern Diesel Locomotive 326 at Saint Paul, Minnesota, 1966, Big Sky Blue paint scheme. Other subject classes: Locomotive

Great Northern Diesel Locomotive 324 at Saint Paul, Minnesota, 1967, simplified orange/green paint scheme. Other subject classes: Locomotive

Great Northern Diesel Locomotive 139 at Saint Paul, Minnesota, June 5, 1971, simplified orange/green paint scheme. Other subject classes: Locomotive

Great Northern Diesel Locomotive 122 at Saint Paul, Minnesota, June 5, 1971, simplified orange/green paint scheme. Other subject classes: Locomotive