In a fully equipped engine shed the borrowed steam would
be obtained from a fixed boiler conveniently placed and specially arranged
for the purpose of raising steam. In practice steam can be raised from
cold water to 3 atm. pressure--45 lb. per square inch--in twenty minutes.
The use of auxiliary steam is then dispensed with, and the spray jet is
worked by steam from its own boiler; a pressure of 8 atm.--120 lb.--is
thus obtained in fifty to fifty-five minutes from the time the spray jet
was first started. In daily practice, when it is only necessary to raise
steam in boilers already full of hot water, the full pressure of 7 to 8
atm. is obtained in from twenty to twenty-five minutes. While
experimenting with liquid fuel for locomotives, a separate tank was placed
on the tender for carrying the petroleum, having a capacity of about 3
tons. But to have a separate tank on the tender, even though fixed in
place, would be a source of danger from the possibility of its moving
forward in case of collision. It was therefore decided, as soon as
petroleum firing was permanently introduced, to place the tank for fuel in
the tender between the two side compartments of the water tank, utilizing
the original coal space. For a six-wheeled locomotive the capacity of the
tank is 3-1/2 tons of oil--a quantity sufficient for 250 miles, with a
train of 480 tons gross exclusive of engine and tender.
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