Northern Pacific 43.5-foot, open, 3-bay, hopper car number 71022 in a yard at Albuquerque, New Mexico, in October 1978. The car is part of the 71000-71499 number series. Photo by GJ Werkema. Other subject classes: freight car, open hopper car

Northern Pacific 43.5-foot, open, 3-bay, hopper car number 71022 in a yard at Albuquerque, New Mexico, on February 26, 1980. The car is part of the 71000-71499 number series. Photo by GJ Werkema. Other subject classes: freight car, open hopper car

Northern Pacific 43.5-foot, open, 3-bay, hopper car number 71104 in a yard at Albuquerque, New Mexico, on March 13, 1973. The car is part of the 71000-71499 number series. Photo by GJ Werkema. Other subject classes: freight car, open hopper car

Northern Pacific 43.5-foot, open, 3-bay, hopper car number 71104 in a yard at Albuquerque, New Mexico, on March 13, 1978. The car is part of the 71000-71499 number series. Photo by GJ Werkema. Other subject classes: freight car, open hopper car

Northern Pacific 43.5-foot, open, 3-bay, hopper car number 72064 in a yard at Albuquerque, New Mexico, on May 21, 1980. The car is part of the 72000-72099 number series. Photo by GJ Werkema. Other subject classes: freight car, open hopper car

Northern Pacific 43.5-foot, open, 3-bay, hopper car number 72065 in a yard at Albuquerque, New Mexico, on November 23, 1978. The car is part of the 72000-72099 number series. Photo by GJ Werkema. Other subject classes: freight car, open hopper car

Northern Pacific 43.5-foot, open, 3-bay, hopper car number 72065 in a yard at Albuquerque, New Mexico, on May 3, 1981. The car is part of the 72000-72099 number series. Photo by GJ Werkema. Other subject classes: freight car, open hopper car

Northern Pacific 43.5-foot, open, 3-bay, hopper car number 72065 in a train at Albuquerque, New Mexico, on January 27, 1981. The car is part of the 72000-72099 number series. Photo by GJ Werkema. Other subject classes: freight car, open hopper car

Northern Pacific 43.5-foot, open, 3-bay, hopper car number 72136 in a yard at Albuquerque, New Mexico, on November 11, 1978. The car is part of the 72100-72199 number series. Photo by GJ Werkema. Other subject classes: freight car, open hopper car

Northern Pacific 43.5-foot, open, 3-bay, hopper car number 72136 on a siding at Albuquerque, New Mexico, on January 9, 1979. The car is part of the 72100-72199 number series. Photo by GJ Werkema. Other subject classes: freight car, open hopper car