Reefer, 40 Foot, R-40-23

History: PFE built the Class R-40-23 steel ice-cooled refrigerator car in 1947. This was the largest class of steel cars they built. In this version, the placard board was moved to the left of the car door and a little higher, and the smaller board seen on Class R-40-20 was omitted. And once again, the route card board was applied at the left bolster.

These cars feature Murphy steel roofs, W-corner 3/3 Improved Dreadnaught ends and 4'-0" doors. A group of 1000 cars was converted for Temco service and renumbered 20002-21001 in 1960-61. Another group of 15 cars was rebuilt with 6' plug doors for Polarstream Liquid Nitrogen cooling and renumbered 1001-1015 in 1965. Another group of 239 cars was renumbered into the 36001-36500 series for TIV service in 1965-66. The Temco equipped cars had it removed in 1966 and were renumbered to 35002-36000. The cars 1001-1015 were renumbered 36501-36515 for TIV service in 1968.

Railroad/Company: Pacific Fruit Express (reporting mark PFE) was an American railroad refrigerator car leasing company that at one point was the largest refrigerator car operator in the world. The company was founded on December 7, 1906 as a joint venture between the Union Pacific and Southern Pacific railroads. It began operation on October 1, 1907, with a fleet of 6,600 refrigerator cars built by the American Car and Foundry Company (ACF).

In 1923, the Western Pacific Railroad joined the venture by leasing its own, brand new fleet of 2775 reefers to PFE. They were painted in standard PFE colors with only WP heralds on the cars instead of the paired UP-SP markings. The WP cars were all retired by the late 1950s, among the last wooden reefers in PFE's fleet. WP ended its partnership with PFE in late 1967 and joined Fruit Growers Express instead.

PFE's assets were divided between the UP and SP when the company was split on April 1, 1978. It is now a UP subsidiary.