Before giving permission for movements not governed by fixed signal within interlocking limits, the Dispatcher must determine that?

Before giving permission for movements not governed by fixed signal within interlocking limits, the Dispatcher must determine that?

• A. All of the above.
• B. Affected appliances are properly positioned and secured with blocking devices.
• C. No opposing or conflicting movements have been authorized.
• D. Blocking devices have been applied to protect against opposing movements.

Answer: (A)

When movements are allowed within interlocking limits but not governed by fixed signals, safety rests on confirming multiple protections are in place. The Dispatcher must verify that the affected appliances—such as switches, derails, and related equipment within the interlocking—are properly positioned and secured with blocking devices. He must also confirm that no opposing or conflicting movements have been authorized, and that blocking devices have been applied to guard against any opposing movement. If all three conditions are satisfied, the non-signalized movement can be permitted. This is why the correct approach is to require all of the above.

When movements are allowed within interlocking limits but not governed by fixed signals, safety rests on confirming multiple protections are in place. The Dispatcher must verify that the affected appliances—such as switches, derails, and related equipment within the interlocking—are properly positioned and secured with blocking devices. He must also confirm that no opposing or conflicting movements have been authorized, and that blocking devices have been applied to guard against any opposing movement. If all three conditions are satisfied, the non-signalized movement can be permitted. This is why the correct approach is to require all of the above.