Northern Pacific 41.5-foot, open hopper car number 87742 on a siding at Denver, Colorado, on April 23, 1989. The car is part of the 87500-87749 number series. Photo by GJ Werkema. Other subject classes: frieght car, open hopper car

Northern Pacific 41.5-foot, open hopper car number 87541 in a train at Skykomish, Washington, on April 10, 1988. The car is part of the 87500-87749 number series. Photo by GJ Werkema. Other subject classes: frieght car, open hopper car, 77T Ballast car

Northern Pacific housing flat car 201304 in a train at Denver, Colorado, on January 26, 1982. The 50-foot flat car has a housing attached permenantly attached for use by maintenance-of-way crews. Other subject classes: flat car, maintenance-of-way

Northern Pacific 41.5-foot, open hopper car number 87937 on a turntable fan track at Denver, Colorado, on March 23, 1981. The car is part of the 87750-87999 number series. Photo by GJ Werkema. Other subject classes: freight car, open hopper car

Northern Pacific 49.5-foot, 3-bay, covered hopper car number 76963 in a yard at Denver, Colorado, on August 26, 1980. The car is part of the 76700-76999 number series. Photo by GJ Werkema. Other subject classes: freight car, covered hopper car

Northern Pacific 49.5-foot, 3-bay, covered hopper car number 76216 on a siding at Denver, Colorado, on June 5, 1978. The car is part of the 76200-76299 number series. Photo by GJ Werkema. Other subject classes: freight car, covered hopper car

Northern Pacific 35-foot 5-inch, 2-bay, covered hopper car number 76050 in a train at Denver, Colorado, on September 20, 1976. The car is part of the 76000-76119 number series. Photo by GJ Werkema. Other subject classes: freight car, covered hopper car

Northern Pacific 36-foot, 2-bay, covered hopper car number 75271 in a yard at Denver, Colorado, on February 14, 1965. The car is part of the 75200-75299 number series. Photo by GJ Werkema. Other subject classes: freight car, covered hopper car

Northern Pacific 36-foot, 2-bay, covered hopper car number 75243 in a yard at Denver, Colorado, on July 5, 1976. The car is part of the 75200-75299 number series. Photo by GJ Werkema. Other subject classes: freight car, covered hopper car

Northern Pacific 50.25-foot, open, 3-bay, hopper car number 73086 on a siding at Denver, Colorado, on June 12, 1985. The car is part of the 73000-73199 number series. Photo by GJ Werkema. Other subject classes: freight car, open hopper car