The live steam injector was a relatively simple device consisting of a steam inlet pipe, a water inlet pipe, a delivery pipe and an overflow pipe plus three internal cones. Steam from the boiler was admitted into a narrowing steam cone which turned the pressure of the steam into velocity. Next, the steam was allowed to combine with the water, piped from the tender tank, in the also narrowing combining cone. The effect of combining the cold water and steam was to partially condense the steam and heat the water. The hot water and remaining steam propelled itself at high speed out of the combining cone and into the neck of the delivery cone. The delivery cone widened into the delivery pipe and allowed the conversion of the speed of the hot water into pressure sufficient to overcome the internal pressure in the boiler. Live steam for the injector was supplied through a control valve in the cab. There was also a water control handle. Normally, locomotives were equipped with two injectors.