brake pipe side of the triple piston, conductor's valve and at the rear
angle cock.

5. Q. What is meant by excess pressure, and where is this pressure
carried?

A. Excess pressure is carried in the main reservoir and is the pressure
above that in the brake pipe.

6. Q. Why is excess pressure necessary?

A. To insure the prompt release of all brakes and quick recharge of the
brake pipe and auxiliary reservoirs.

7. Q. How is the amount of excess pressure regulated?

A. By the compressor governor.

8. Q. Name the different parts of the air brake as applied to a car.

A. The triple valve, auxiliary reservoir, brake cylinder, brake pipe,
angle cocks, cut-out cock, retaining valve, centrifugal dirt collector
and strainer tee.

9. Q. What is the duty of the triple valve?

A. The triple valve has three duties to perform: Charge the auxiliary
reservoir; apply the brake; and release the brake.

10. Q. What is the purpose of the auxiliary reservoir?