119. Q. With a 70-pound brake pipe pressure, what pressure should be had in the main reservoir when using this device?
A. About fifty pounds.
120. Q. When the dead engine feature is being used, in what position should the automatic and independent brake valves be carried?
A. Running position.
121. Q. What should be the position of the brake pipe cut-out cock below the brake valve?
A. It should be closed.
DISTRIBUTING VALVE
122. Q. What is the duty of the distributing valve?
A. To admit air from the main reservoir to the locomotive brake cylinders when applying the brake, to automatically maintain the brake cylinder pressure against leakage, to develop the proper brake cylinder pressure regardless of piston travel and to exhaust the air from the brake cylinders when releasing the brake.
123. Q. To what is the distributing valve attached?