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.
87. Q. What is the purpose of holding position?
A. To hold the locomotive brake applied while recharging the brakes. The charging of the brake pipe and equalizing reservoir is the same in holding as in running position.
88. Q. What is the purpose of lap position?
A. To hold both the locomotive and train brakes applied after an automatic application.
89. Q. What is the purpose of service position?
A. This position of the brake valve enables the engineer to make a gradual reduction of brake pipe pressure, thus causing a service application of the brakes.