Which statement best describes how a route clearance is indicated in the signaling system?

• A. A handwritten memo on a bulletin board.
• B. Dispatcher authorization with a route indicator on the signal system.
• C. A verbal confirmation from the conductor.
• D. A printed map with routes.

Answer: (B)

The signaling system indicates route clearance through dispatcher authorization that sets a route indicator on the signals. When the dispatcher clears a specific path, they configure the interlocking so the signals for that route show the appropriate aspect, telling the crew that movement on that path is authorized. This real-time indication is what keeps movements safe and coordinated, preventing conflicts with other routes. External notes like a handwritten memo, a conductor’s verbal confirmation, or a printed map don’t update the signal system and aren’t treated as the official clearance.