Northern Pacific 33.75-foot, open, twin hopper car number 70374 on a siding at Denver, Colorado, on August 26, 1973. The car is part of the 70200-70399 number series. Photo by GJ Werkema. Other subject classes: freight car, open hopper car

The unloading gate detail of Northern Pacific Hart ballast car 87384 at Denver, Colorado, on September 20, 1973. The car is part of the 87000-87499 number series. Photo by GJ Werkema. Other subject classes: frieght car, open hopper car, Rodgers Ballast car

Northern Pacific 41.5-foot, open hopper car number 85356 in a train at Skykomish, Washington, on April 10, 1988. The car is part of the 85100-85499 number series. Photo by GJ Werkema. Other subject classes: frieght car, open hopper car, Hopper

Northern Pacific 41.5-foot, drop-bottom, gondola car number 58801 in a yard at Albuquerque, New Mexico, on November 25, 1979. The car is part of the 58750-58999 number series. Photo by GJ Werkema. Other subject classes: freight car, steel gondola car

Northern Pacific 65-foot, drop-end, gondola car number 56031 in a yard at Bellingham, Washington, on November 8, 2003. The car is part of the 56000-56024 number series. Photo by GJ Werkema. Other subject classes: freight car, steel gondola car

Northern Pacific 41.5-foot, gondola car number 50599 in a train at Bellingham, Washington, on July 27, 1977. The car is part of the 50500-50749 number series. Photo by GJ Werkema. Other subject classes: freight car, steel gondola car

Northern Pacific 60-foot, flat car number 66118 in a yard at Albuquerque, New Mexico, on May 25, 1978. The car is part of the 66100-66244 number series. Photo by GJ Werkema. Other subject classes: freight car, flat car

Northern Pacific 54-foot, flat car number 62783 in a train at Pasco, Washington, on October 1, 1971. The car is part of the 62700-62949 number series. Photo by GJ Werkema. Other subject classes: freight car, flat car

Northern Pacific 54-foot, flat car number 62467 loaded with heavy equipment in a yard at Albuquerque, New Mexico, on May 21, 1980. The car is part of the 62300-62494 number series. Photo by GJ Werkema. Other subject classes: freight car, flat car

Northern Pacific Day/Nite coach at the Burlington passenger station at Denver, Colorado, in January 1971. Photo by GJ Werkema. Other subject classes: passenger car, coach