High Quality Content by WIKIPEDIA articles! Pacific Fruit Express (reporting mark PFE) was a 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).