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The last stand of the GG1s on Amtrak and Conrail circa 1977. Almost all of this film was taken around Harrisburg along the spiderweb of lines Conrail and Amtrak were still operating, including a short scene at Lemo tower, the only at grade crossing of electrified lines on the former PRR. The sequence toward the end with the Silverliners and Amtrak I think was Thorndale near Philadelphia.