A. To provide a large and direct opening from the main reservoir to the
brake pipe, for the free flow of air, when charging and recharging the
brakes.
84. Q. What pressure will be had in the brake pipe if the brake valve be
left in release position?
A. Main reservoir pressure.
85. Q. Can the locomotive brake be released by the automatic brake valve
in release position, when using the H-6 valve?
A. No; as the port in the automatic brake valve to which the
distributing valve release pipe is attached is blanked in this position
of the valve.
86. Q. What is the purpose of running position, and when should it be
used?
A. This is the proper position for the brake valve when the brakes are
charged and not in use, also when it is desired to release the
locomotive brake with this valve. In this position the brake pipe
pressure is maintained at a predetermined amount by the feed valve, as
all air that now enters the brake pipe must pass through the feed valve.