When a locomotive will immediately run-around or couple to cars at the opposite end of a cut, is it permissible to have the angle cocks at both ends of the cut in the closed position?

When a locomotive will immediately run-around or couple to cars at the opposite end of a cut, is it permissible to have the angle cocks at both ends of the cut in the closed position?

• A. True
• B. False
• C. Only if the cut has been in emergency for at least 60 seconds
• D. Not permitted under any circumstances

Answer: (A)

Isolating the brake line while repositioning a locomotive is the key idea. When a locomotive will run around to the opposite end of a cut and then couple, you can safely leave the angle cocks at both ends closed. This keeps the brake piping isolated and prevents air from leaking or brakes from unintentionally applying while you move into position. Once you’ve reached the far end and are ready to couple, you open the angle cocks again to charge the line and control the brakes as needed. This is a standard, controlled way to move without compromising the brake system.

Isolating the brake line while repositioning a locomotive is the key idea. When a locomotive will run around to the opposite end of a cut and then couple, you can safely leave the angle cocks at both ends closed. This keeps the brake piping isolated and prevents air from leaking or brakes from unintentionally applying while you move into position. Once you’ve reached the far end and are ready to couple, you open the angle cocks again to charge the line and control the brakes as needed. This is a standard, controlled way to move without compromising the brake system.