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This 600 hp Gas Engine at the Western Minnesota Steam Thresher's Reunion show in Rollag, MN (rollag.com) runs every Labor Day Weekend.
Built in 1914-15 by the Snow Holly Works Schenectady NY, it ran continuously for over fifty years compressing natural gas at National Fuel Gas Corporation's Roystone Station near Titusville, PA

The engine is 65 feet long and weighs 140 tons. It's foundation is up to 10 feet thick, and contains 157 cubic yards of concrete reinforced with 8000 feet of steel bar.

It has four combustion chambers with a bore and stroke of 24" x 48" giving it a displacement of 81,388 cubic inches (1,334 Liters). (excluding the displacement of the 6 inch diameter piston rod).
Produces 600 HP at 80 RPM.
Flywheel is 18 feet in diameter and weighs 24 tons
Crankshaft is 16 inches in diameter and weighs 12 tons.

This colossal engine is one of four, custom built for the Royalston Pumping Station. Two were scrapped, and the other one is at the Coolspring Power Museum in PA.(coolspringpowermuseum.org/Projects)