| Oil Power. Here is a duplicate 35mm color slide by an unidentified photographer that was taken near Union Station in St. Louis, Missouri, c. 1952. Shown here (L to R) is Pennsylvania Railroad engine #5753 and two more units whose road numbers are not recorded. All are AP-20's built by the American Locomotive Company and rated at 2,000 horsepower each. #5753 was constructed as an AP-20 in October of 1947, later regeared and reclassified as an AFP-20, and retired in September of 1962 after just 15 years of revenue service. |