A. A very moderate level, never allowing it to get so high that moist
steam will pass through the cylinders, because for satisfactory service
a compound engine should always have dry steam.

10. Q. How should a compound locomotive be started with a long train?

A. In simple position with cylinder cocks open.

11. Q. When drifting what should be the position of the separate exhaust
valve, the cylinder and port cocks?

A. Open position.

12. Q. What will cause two exhausts of air to blow from the three-way
cock or simpling valve in the cab when the engine is being changed to
compound?

A. A sticky exhaust valve. It does not move when air is first
discharged. The second exhaust comes when it does move.

13. Q. What does steam blowing at the three-way cock indicate?

A. The separate exhaust valve not seating properly caused by stuck
valves, a weak or broken spring, or the packing rings of separate
exhaust valve leaking.

14. Q. What can be done if the engine will not operate compound when the
air pressure on the separate exhaust valve is released by the three-way
cock?