A. To provide a means of charging the main reservoir of an engine whose
compressor is inoperative.
118. Q. What is the object of charging a main reservoir of an engine
with a disabled compressor?
A. As the air used in the locomotive brake cylinders comes from the main
reservoir, for the brakes to be operated on this engine it is necessary
that its main reservoir be charged.
119. Q. With a 70-pound brake pipe pressure, what pressure should be had
in the main reservoir when using this device?
A. About fifty pounds.
120. Q. When the dead engine feature is being used, in what position
should the automatic and independent brake valves be carried?
A. Running position.
121. Q. What should be the position of the brake pipe cut-out cock below
the brake valve?
A. It should be closed.