Pennsylvania Railroad Class FF1
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"The Pennsylvania Railroad’s class FF1 was an American electric locomotive, a prototype numbered #3931 and nicknamed "Big Liz". It was built in 1917 to haul freight trains across the Allegheny Mountains where the PRR planned to electrify. "Big Liz" proved workable but too powerful for the freight cars of the time with its 4,600 hp (3,400 kW) and 140,000 lbf (620 kN) of tractive effort. Pulling the train it regularly snapped couplers and when moved to the rear as a pusher its force was sufficient to pop cars in the middle of the train off the tracks."
Info from Wikipedia
