Great Northern Diesel Locomotive 720, Class GP9 in Wenatchee, Washington, undated. Photograph by Wade Stevenson.

Great Northern Diesel Locomotive 717, Class GP9 in Wenatchee, Washington, undated. Photograph by Wade Stevenson.

Great Northern Diesel Locomotive 715 at Wenatchee, Washington, July 1969, simplified orange/green paint scheme. Other subject classes: Locomotive

Great Northern Diesel Locomotive 714, Class GP9 in Wenatchee, Washington, undated. Photograph by Wade Stevenson.

Great Northern Diesel Locomotive 693, Class GP9 in Wenatchee, Washington, undated. This photograph was taken before dynamic brakes were installed. Photograph by Wade Stevenson.

Great Northern Diesel Locomotive 692 at Wenatchee, Washington on undated. The photograph shows an Electro-Motive Division Type GP-9, Great Northern Class GP-9. The locomotive is painted in the simplified green and orange scheme. Other subject classes: Locomotive-Diesel

Great Northern Diesel Locomotive 688 at Wenatchee, Washington, June 8, 1968, Big Sky Blue paint scheme. Other subject classes: Locomotive

Great Northern Diesel Locomotive 688 at Wenatchee, Washington, June 8, 1968, Big Sky Blue paint scheme. Other subject classes: Locomotive

Great Northern Diesel Locomotive 668, Class GP9 in Wenatchee, Washington, undated. Photograph by Wade Stevenson.

Great Northern Diesel Locomotive 668, Class GP9 in Wenatchee, Washington, undated. Photograph by Wade Stevenson.