When pulling triples, which valve should be closed?

Shut-off valve at the rear of the last trailer.. Section 7.2: Only the valve at the very end of the train (last trailer) should be closed.

When pulling triples, which valve should be closed?

ANSWER BREAKDOWN
  • A. Incorrect. "Shut-off valve at the rear of the front trailer." is not correct. Only the valve at the very end of the train (last trailer) should be closed.
  • B. Incorrect. "Shut-off valve at the rear of the middle trailer." is not correct. Only the valve at the very end of the train (last trailer) should be closed.
  • C. Correct. Only the valve at the very end of the train (last trailer) should be closed.
  • D. Incorrect. "None." is not correct. Only the valve at the very end of the train (last trailer) should be closed.