Great Northern Diesel Locomotive 2524, Class U28B in Washington State, undated. Photograph by Wade Stevenson.

Great Northern Diesel Locomotive 2524, undated. The photograph shows several locomotives exiting a tunnel. The lead locomotive is a GE Type U28B, Great Northern Class U28B painted in the simplified green and orange scheme. Other subject classes: Locomotive-Diesel, Mountains, Tunnel

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 2527 at Minneapolis, Minnesota, 1968, Big Sky Blue paint scheme. Other subject classes: Locomotive

Great Northern Diesel Locomotive 2527, Class U28B in Washington State, undated. Photograph by Wade Stevenson.

Great Northern Diesel Locomotive 2527, Class U28B in Washington State, undated. Photograph by Wade Stevenson.

Great Northern Diesel Locomotive 2527, Class U28B in Washington State, undated. Photograph by Wade Stevenson.

Great Northern Diesel Locomotive 2527, Class U28B in Washington State, undated. Photograph by Wade Stevenson.

Great Northern Diesel Locomotive 2527, Class U28B in Washington State, undated. Photograph by Wade Stevenson.

Great Northern Diesel Locomotive 2528, Class U28B in Havre, Montana, undated. Photograph by Wade Stevenson.