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On a Sellers Lifting Injector the brass handle controls both; in first position it turns on the water and all the way back turns on the steam. On a non-lifting injector, sometimes the starting (steam) valve is in the cab, but usually both steam and water valve handles come up through the bottom of the cab. Modern non-lifting injectors such as the Nathan 4000 have a single handle on a quadrant with the operating rod going through the floor of the cab. Water is admitted to the boiler through a check valve which prevents steam from blowing back into the injector. Locomotives were required to have two means for getting water into the boiler. Modern locomotives used an injector and a feedwater heater which used a mechanical pump. Both put the water in through check valves. The injector was usually on the engineer's side and the feedwater heater/pump on the fireman's side. Both sides had boiler checks, but some railroads (N&W notably) used a double check on the top of the boiler. Old Timer
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