| Oil Power. Here is a duplicate 35mm color slide by an unidentified photographer that was taken near Millersburg, Pennsylvania, on 1 January 1960. Shown here (R to L) are Pennsylvania Railroad engine #9660 and two more "EF" Class units whose road numbers are not recorded. All were built by GM-EMD and rated at 1,500 horsepower each. #9660 was constructed in March of 1950. |