Missouri Pacific Railroad diesel locomotive 6027 at Green River, Wyoming on July 30, 1986. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Northern Pacific 60-foot, steel wood chip car number 119809 on a siding at Newcastle, Wyoming, on September 11, 1999. The car is part of the 119700-119999 number series. Photo by GJ Werkema. Other subject classes: freight car, steel wood-chip car

Northern Pacific 59-foot, steel wood chip car number 582630 in a yard at Newcastle, Wyoming, on September 11, 1999. The car is part of the 582500-582649 number series. Photo by GJ Werkema. Other subject classes: freight car, steel wood-chip car

Union Pacific Railroad steam locomotive number 4004 on display at Cheyenne, Wyoming on July 29, 1986. UP 4004 rests in a park at Cheyenne Wyoming in 1986. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive.

Union Pacific Railroad steam locomotive number 4004 on display at Cheyenne, Wyoming on July 29, 1986. UP 4004 rests in a park at Cheyenne Wyoming in 1986. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive.

Union Pacific Railroad steam locomotive number 4004 on display at Cheyenne, Wyoming on July 29, 1986. UP 4004 rests in a park at Cheyenne Wyoming in 1986. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive.

Union Pacific Railroad steam locomotive number 4004 on display at Cheyenne, Wyoming on July 29, 1986. UP 4004 rests in a park at Cheyenne Wyoming in 1986. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive.