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

Burlington Northern NW12 (NW2R) diesel locomotive Number 19 (Ex-Great Northern 5322, Great Northern 122, Burlington Northern 469 rebuilt in October 1976 in Denver, Colorado on December 5, 1981. Burlington Northern SW7 diesel locomotive Number 107 also partially visible. Photo by Al Christianson.

Burlington Northern Diesel Locomotive, Type SW9 Number 161 at Denver, Colorado on September, 5 1981. Number 161 was built by Electro-Motive Division (EMD) in September 1951 as Chicago, Burlington and Quincy Number 9270, Builder Number 13213. It was retired in November, 1984. Front 3/4 view, engineer's side. Photo by Al Christianson.

Burlington Northern Diesel Locomotive, Type SW7 Number 119 at Denver, Colorado on October 18, 1981. Number 119 was built by Electro-Motive Division (EMD) in May, 1950 as Chicago, Burlington and Quincy Number 9253, Builder Number 8497. It was retired in October, 1985. Photo by Al Christianson.

Burlington Northern diesel locomotive 6228 at Denver, Colorado on December 5, 1981. Number 6228 is an SD9 built by Electro-Motive Division (GM), builder's number 25013. Photo by Al Christianson.

Burlington Northern diesel locomotive 6218 at Denver, Colorado on September 5, 1981. Number 6218 is an SD9 built by Electro-Motive Division (GM), builder's number 22406. The locomotive is sub-lettered for the C&S ( for Colorado & Southern).

Burlington Northern Diesel Locomotive 436 at Denver, Colorado, June 16, 1974, Big Sky Blue paint scheme (as Burlington Northern 6609). Other subject classes: Locomotive

Burlington Northern Diesel Locomotive 436 at Denver, Colorado, June 16, 1974, Big Sky Blue paint scheme (as Burlington Northern 6609). Other subject classes: Locomotive

Burlington Northern Diesel Locomotive 423 at Denver, Colorado, May 24, 1970, Big Sky Blue paint scheme (as Burlington Northern 6453). Other subject classes: Locomotive

Burlington Northern Diesel Locomotive 403 at Denver, Colorado, August 1971, Big Sky Blue paint scheme (as Burlington Northern 6433). Other subject classes: Locomotive

Burlington Northern Diesel Locomotive 403 at Denver, Colorado, August 1971, Big Sky Blue paint scheme (as Burlington Northern 6433). Other subject classes: Locomotive

Burlington Northern Diesel Locomotive 327 at Denver, Colorado, May 24, 1972, Big Sky Blue paint scheme (as Burlington Northern 9857). Other subject classes: Locomotive

Burlington Northern Diesel Locomotive 3005 at Denver, Colorado, November 1970, Big Sky Blue paint scheme (as Burlington Northern 2205). Other subject classes: Locomotive

Burlington Northern Diesel Locomotive 3005 at Denver, Colorado, November 1970, Big Sky Blue paint scheme (as Burlington Northern 2205). Other subject classes: Locomotive

Burlington Northern Diesel Locomotive 2539 at Denver, Colorado, October 1971, Big Sky Blue paint scheme (as Burlington Northern 5709). Other subject classes: Locomotive

Burlington Northern Diesel Locomotive 2024 at Denver, Colorado, November 1970, Big Sky Blue paint scheme (as Burlington Northern 2024). Other subject classes: Locomotive

Burlington Northern Diesel Locomotive 2016 at Denver, Colorado, August 16, 1970, original orange/green paint scheme, formerly Great Northern 2016. Other subject classes: Locomotive

Burlington Northern Diesel Locomotive 2016 at Denver, Colorado, August 16, 1970, original orange/green paint scheme, formerly Great Northern 2016. Other subject classes: Locomotive

Burlington Northern Diesel Locomotive 2016 at Denver, Colorado, August 16, 1970, original orange/green paint scheme, formerly Great Northern 2016. Other subject classes: Locomotive

Burlington Northern Diesel Locomotive 2016 at Denver, Colorado, August 16, 1970, original orange/green paint scheme, formerly Great Northern 2016. Other subject classes: Locomotive

Burlington Northern Diesel Locomotive 2016 at Denver, Colorado, August 16, 1970, original orange/green paint scheme, formerly Great Northern 2016. Other subject classes: Locomotive