N Scale GS-4 Southern Pacific Line #4449Details: The GS 4 runs on eight massive 80 drivers, 300lbs psi boiler pressure, and puts out a roaring 5,500 horsepower at 55mph, with a maximum speed of 110 mph. The large drivers gave the locomotive a high top speed; the telling mark of a steam engine built for passenger service. The GS 4 was built for the Southern Pacific Railroad by the Lima Locomotive Works and delivered in the early 1940s for the SPs premier passenger trains, finding its way to