When an ABS failure occurs, non-signaled DCS rules may be substituted by Bulletin Order or Form D line 6.

When an ABS failure occurs, non-signaled DCS rules may be substituted by Bulletin Order or Form D line 6.

• A. Only with Dispatcher approval
• B. True
• C. Not allowed
• D. False

Answer: (B)

When ABS is out, you can’t rely on automatic signal protection, so railroads use documented temporary rules to keep operations safe. Substituting the non-signaled DCS rules with a Bulletin Order or Form D line 6 provides an approved, time-limited set of instructions that tell crews exactly how to move—the required speeds, train meet points, and authority on the affected track—until ABS is restored. Because the Bulletin Order or Form D line 6 themselves carry the dispatcher’s approved guidance, there’s no separate approval step needed beyond their issuance.

When ABS is out, you can’t rely on automatic signal protection, so railroads use documented temporary rules to keep operations safe. Substituting the non-signaled DCS rules with a Bulletin Order or Form D line 6 provides an approved, time-limited set of instructions that tell crews exactly how to move—the required speeds, train meet points, and authority on the affected track—until ABS is restored. Because the Bulletin Order or Form D line 6 themselves carry the dispatcher’s approved guidance, there’s no separate approval step needed beyond their issuance.