Great Northern Boxcar 37750 at Longmont, Colorado, August 28, 1980. Other subject classes: Box car

Great Northern Boxcar 39895 at Longmont, Colorado, August 28, 1980. Other subject classes: Box car

Great Northern Covered Hopper Car 170092 at Longmont, Colorado, August 28, 1980, Association of American Railroads Class LO. Other subject classes: Covered hopper car

Great Northern Covered Hopper Car 170131 at Longmont, Colorado, August 28, 1980, Association of American Railroads Class LO. Other subject classes: Covered hopper car

Great Northern Covered Hopper Car 172535 at Longmont, Colorado, August 28, 1980, Association of American Railroads Class LO. Other subject classes: Covered hopper car

Great Northern Flatcar 160026 at Longmont, Colorado, March 13, 1985, Association of American Railroads Class FB, bulkhead. Other subject classes: Flat car

Great Northern Gondola 78563 at Longmont, Colorado, December 31, 1989, Association of American Railroads Class GB. Other subject classes: Gondola

Great Northern Hopper Car 70143 at Longmont, Colorado, March 22, 1981, Association of American Railroads Class HT. Other subject classes: Hopper car

Great Northern Hopper Car 70238 at Longmont, Colorado, January 1990, Association of American Railroads Class HT. Other subject classes: Hopper car

Great Northern Hopper Car 70280 at Longmont, Colorado, January 13, 1990, Association of American Railroads Class HT. Other subject classes: Hopper car

Great Northern Hopper Car 70336 at Longmont, Colorado, March 22, 1981, Association of American Railroads Class HT. Other subject classes: Hopper car

Great Northern Hopper Car 70350 at Longmont, Colorado, March 22, 1981, Association of American Railroads Class HT. Other subject classes: Hopper car

Great Northern Hopper Car 70350 at Longmont, Colorado, March 22, 1981, Association of American Railroads Class HT. Other subject classes: Hopper car

Great Northern Hopper Car 70374 at Longmont, Colorado, January 13, 1990, Association of American Railroads Class HT. Other subject classes: Hopper car

Great Northern Hopper Car 73105 at Longmont, Colorado, March 1974, Association of American Railroads Class HM. Other subject classes: Hopper car

Northern Pacific 40.75-foot, box car number 17410 with one sliding door is in a yard at Longmont, Colorado, on June 7, 1978. The car is part of the 17000-17499 number series. Photo by GJ Werkema. Other subject classes: freight car, steel box car

Northern Pacific 40.75-foot, box car number 26969 with one sliding door is on a siding at Longmont, Colorado, on June 7, 1978. The car is part of the 26000-27349 number series. Photo by GJ Werkema. Other subject classes: freight car, steel box car

Northern Pacific 40.75-foot, box car number 26969 with one sliding door is on a siding at Longmont, Colorado, on June 7, 1978. The car is part of the 26000-27349 number series. Photo by GJ Werkema. Other subject classes: freight car, steel box car

Northern Pacific 40.5-foot, box car number 3168 with plug and sliding doors is in a train at Longmont, Colorado, on August 28, 1980. The car is part of the 3000-3399 number series. Photo by GJ Werkema. Other subject classes: freight car, steel box car

Northern Pacific 40.5-foot, box car number 8665 with plug and sliding doors is in a yard at Longmont, Colorado, on June 7, 1978. The car is part of the 8450-8849 number series. Photo by GJ Werkema. Other subject classes: freight car, steel box car

Northern Pacific 50.25-foot, open, 3-bay, hopper car number 73006 on a siding at Longmont, Colorado, on August 28, 1980. The car is part of the 73000-73199 number series. Photo by GJ Werkema. Other subject classes: freight car, open hopper car