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 Caboose X155 at Denver, Colorado, August 26, 1973, Big Sky Blue paint scheme (formerly Great Northern X155). Other subject classes: Caboose

Burlington Northern Caboose 10174 at Denver, Colorado, September 2, 1973, Burlington Northern 10174, formerly Great Northern X94. Other subject classes: Caboose

Burlington Northern Caboose 10174 at Denver, Colorado, September 2, 1973, Burlington Northern 10174, formerly Great Northern X94. Other subject classes: Caboose

Burlington Northern Caboose 10076 at Denver, Colorado, June 20, 1981, Big Sky Blue paint scheme. Formerly Great Nothern X116. Other subject classes: Caboose

Burlington Northern Caboose 10076 at Denver, Colorado, September 20, 1976, Big Sky Blue paint scheme. Formerly Great Nothern X116. Other subject classes: Caboose

Burlington Northern 825, former Northern Pacific 7006B at the roundhouse in Denver, Colorado, on September 17, 1973. Northern Pacific 7006B, a type F9B built by General Motors Electromotive Division in 1955. Photo by GJ Werkema. Other subject classes: diesel locomotive, F9B

Burlington Northern 825, former Northern Pacific 7006B at the roundhouse in Denver, Colorado, on September 17, 1973. Northern Pacific 7006B, a type F9B built by General Motors Electromotive Division in 1955. Photo by GJ Werkema. Other subject classes: diesel locomotive, F9B

Burlington Northern 6421, former Northern Pacific 3621 at the diesel shop in Denver, Colorado, on May 24, 1972. Northern Pacific 3621, a type SD45 built by General Motors Electromotive Division in 1968. Photo by GJ Werkema. Other subject classes: diesel locomotive, SD45

Burlington Northern 6412, former Northern Pacific 3612 at the diesel shop in Denver, Colorado, in July 5, 1971. Northern Pacific 3612, a type SD45 built by General Motors Electromotive Division in 1967. Photo by GJ Werkema. Other subject classes: diesel locomotive, SD45