If you are driving a double trailer, the shut-off valves at the back of the last trailer should be:

Closed.. Section 6.2: The last valve in the train must always be closed to hold air pressure.

If you are driving a double trailer, the shut-off valves at the back of the last trailer should be:

ANSWER BREAKDOWN
  • A. Incorrect. "Open." is not correct. The last valve in the train must always be closed to hold air pressure.
  • B. Correct. The last valve in the train must always be closed to hold air pressure.
  • C. Incorrect. "Half open." is not correct. The last valve in the train must always be closed to hold air pressure.
  • D. Incorrect. "Removed." is not correct. The last valve in the train must always be closed to hold air pressure.