cylinder cocks open, and if equipped with
independent brake, it to be applied; in fact, it is an excellent
opportunity for a mechanical officer to judge the ability of the fireman
and future engineer.

63. Q. Is the engineer responsible for the fireman's conduct while on
duty and for the manner in which the fireman's duties are performed?

A. He is. The fireman is under the direction of the engineer, and the
fireman's duties are to be performed in accordance with the engineer's
instructions.

64. Q. What is the duty of the superheater damper, and how does it
operate?

A. The duty of the damper is to control the flow of gases through the
large flues, thereby protecting the units which are contained therein
from being overheated after throttle is closed. The position of damper
when the engine is not working steam, is closed.

65. Q. What will be the effect on the steaming of the engine if the
damper does not open properly?

A. Engine will steam poorly for the reason that there will be no draft
through the large flues. The steam will not be superheated because
heated gases cannot come in contact with superheated units contained in
the large flues.

66. Q. How may steam failure be avoided in case the damper fails to
operate?

A. The counterweight may be tied up, thereby opening the damper.

=AIR BRAKE QUESTIONS=

1. Q. What is an air brake?

A. A brake operated by compressed air.

2. Q. How is this air compressed?

A. By an air compressor on the locomotive.

3. Q. Name the different parts of the air brake as applied to the
locomotive.

A. The air compressor, compressor governor, automatic and independent
brake valves, distributing valve, triple valve, auxiliary reservoir,
brake cylinders, main reservoir, air gauges, angle cocks, cut-out cocks
and the necessary piping.

4. Q. What is the purpose of the main reservoir?

A. It is used for storing a large volume of air for the purpose of
promptly charging and recharging the brakes. Where the engine is
equipped with either the E. T. or L. T. type of brakes, main reservoir
air is used to supply the air to the brake cylinders on the locomotive.

5. Q. What other appliances use main reservoir air?

A. It is used in the operation of the power reverse gear, sand blower,
bell ringer, water scoop, air signal, fire door, water sprinkler and
other devices.

6. Q. What does the red hand on each of the air gauges indicate?

A. The red hand on the large