Leavitt-Riedler Pumping Engine

The engine drew steam from a coal-fired boiler, and had a pump valve mechanism which allowed its high-speed operation at a hydraulic head of 128 feet (39 m).

At its normal speed of 50 revolutions per minute, it pumped 25 million gallons of water in 24 hours.

[2] The engine was taken out of service in 1928 but remains in its original location and it is open for public viewing as an exhibit in the Metropolitan Waterworks Museum.

The engine itself is of an unusual triple-expansion, three-crank rocker design, with pistons 13.7, 24.375, and 39 inches (348.0, 619.1, and 990.6 mm) in diameter and 6-foot (1.8 m) stroke.

The unusual diagonal plungers were created in part by the limitation of the existing engine room.