Northern Pacific 50-foot, single plug door, refrigerator car 97552 is in a yard at Albuquerque, New Mexico, on May 30, 1980. The car is part of the 97500-97549 number series. Photo by GJ Werkema. Other subject classes: freight car, refrigerator car

Northern Pacific 50-foot, single plug door, refrigerator car 97090 is in a yard at Albuquerque, New Mexico, on August 5, 1979. The car is part of the 97000-97099 number series. Photo by GJ Werkema. Other subject classes: freight car, refrigerator car

Northern Pacific 50-foot, single plug door, refrigerator car 97007 is in a siding at Albuquerque, New Mexico, on May 30, 1980. The car is part of the 97000-97099 number series. Photo by GJ Werkema. Other subject classes: freight car, refrigerator car

Northern Pacific 50-foot, single plug door, insulated refrigerator car 96113 is in a yard at Albuquerque, New Mexico, on March 8, 1997. The car is part of the 96000-96199 number series. Photo by GJ Werkema. Other subject classes: freight car, refrigerator car

Northern Pacific 50-foot, single plug door, insulated refrigerator car 96099 is in a siding at Las Vegas, New Mexico, on September 9, 1984. The car is part of the 96000-96199 number series. Photo by Evan Werkema. Other subject classes: freight car, refrigerator car

Northern Pacific 50-foot, single plug door, insulated refrigerator car 96091 is in a siding at Clovis, New Mexico, on September 9, 1984. The car is part of the 96000-96199 number series. Photo by GJ Werkema. Other subject classes: freight car, refrigerator car

Northern Pacific 50-foot, single plug door, insulated refrigerator car 96086 is in a siding at Albuquerque, New Mexico, on March 10, 1991. The car is part of the 96000-96199 number series. Photo by Evan Werkema. Other subject classes: freight car, refrigerator car

Northern Pacific 50-foot, single plug door, insulated refrigerator car 96086 is coupled to Santa Fe locomotive 5319 in a train at Albuquerque, New Mexico, on June 20, 1990. The car is part of the 96000-96199 number series. Photo by Evan Werkema. Other subject classes: freight car, refrigerator car

Northern Pacific 50-foot, single plug door, insulated refrigerator car 96017 is in a yard at Albuquerque, New Mexico, on June 13, 1992. The car is part of the 96000-96199 number series. Photo by GJ Werkema. Other subject classes: freight car, refrigerator car