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The last stand of the GG-1s 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.