Northern Pacific 41.5-foot, open hopper car number 87077 in a yard at Amarillo, Texas, on October 12, 1976. 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 tank car 102040 at the refueling facility at Denver, Colorado, on October 22, 1989. The car is in company fuel service. Photo by GJ Werkema. Other subject classes: freight car, tank car

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

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