ontrol cylinder pipe breaks, what effect will it have
and what must be done?

A. The locomotive brake cannot be applied with the automatic brake
valve; by plugging the pipe, this feature of the brake will be restored,
but the independent release feature will be lost.

189. Q. If any of the pipes here enumerated breaks, will it in any way
affect an application of the independent brake?

A. No; as the independent and automatic features are entirely separate
from each other; that is, the automatic control valve is not brought
into use when an independent application of the brake is made.

CONTROL VALVE DEFECTS

190. Q. If there is a blow at the control valve exhaust port when the
brake is released, where would you look for the trouble?

A. This would indicate a leaky application valve, or a leak past the
emergency valve.

191. Q. If there be a continuous blow at the control valve exhaust port
when the brake is applied, where would you look for the trouble?

A. This would indicate leakage past the exhaust valve 7.

192. Q. If the locomotive brake released with the automatic brake valve
in lap position, where is the trouble?

A. Would look for a leak in the control reservoir pipe or special
release valve.

193. Q. If the brake remained applied in lap position, but released in
release or holding position, where would you look for the trouble?

A. This would indicate a leak in the control valve release pipe.

MISCELLANEOUS

194. Q. What is meant by an application of the brake?

A. The first and all following reductions, until the brake is released.

195. Q. How many applications of the brake should be made when making a
stop with a passenger train, and why?

A. Two; the first a heavy one to reduce the speed quickly, and the
second a light one to complete the stop; thereby preventing wheel
sliding and shock to the train.

196. Q. How many applications of the brake should be made when making a
stop with a long freight train?

A. One; this to prevent the possibility of causing damage to the train.

197. Q. Explain how a stop should be made with a freight train.

A. Probably no more difficult question to answer could be asked, as the
service braking of a train must be governed by the condition surrounding
it; meaning, relation of brake power to weight of train; rail condition;
speed and grade. To prevent breaking in two and other damage, freight
trains should be stopped with one brake appli