Before a boiler is fired up it must be filled with water until the crown sheet is covered to a depth of several inches. Usually one section of grate is of a different type from the other sections. A locomotive is always provided with two independent means of supplying water to the boiler. A lifting injector will not prime if the water in the supply pipe is too hot. List four reasons why the injector primes but will not force water into the boiler.
Some steam locomotives utilize three sets of engines.
The joint between the boiler and the saddle has to be absolutely rigid, however, there must be some allowance where the boiler connects with the frame. Briefly, describe grease lubrication of a locomotive driving box. List the four common classifications of valves. List one reason why there is a slight offset in the bull ring which fits a similar offset in the packing ring. Packing rings are turned to a diameter slightly larger than the busing.