Pan Am Railways was having a difficult time. POED with 102 cars and weighing 4,882 tons, had stalled climbing the hill west of Shirley when its lead locomotive suffered some electrical difficulties. To get the train moving, this Norfolk Southern GE DASH8-40C was sent from Ayer to assist. The train is on the move heading west at Derby Curve just after 1:34 in the afternoon. Canon EOS 7D with 100mm lens.