Which horn signal is used as an acknowledgement of a hand signal to back up?

Which horn signal is used as an acknowledgement of a hand signal to back up?

• A. The Horn signal for Acknowledgement of hand signal to back up.
• B. The horn sound for Approaching Roadway Workers or their equipment on or near the track, regardless of whistle prohibitions.
• C. The horn signal for Acknowledgement of a Stop Signal other than a fixed signal.
• D. The horn signal for When standing, start.

Answer: (A)

In NORAC communications, there are specific horn signals tied to different human signals on or near the track. When someone on the ground gives a hand signal to back up, the engineer must acknowledge that signal with the dedicated horn pattern for acknowledging a back-up hand signal. This creates a clear, explicit confirmation that the instruction to back up has been received, reducing the chance of miscommunication in busy or noisy rail environments. The other horn signals govern different situations: one is a warning used when roadway workers or their equipment are on or near the track; another confirms that a stop signal has been acknowledged (not a fixed signal); and another is the signal used when starting from a standing position. But for confirming a hand signal to back up, the appropriate, recognized horn signal is the acknowledgement specifically for that hand signal.

In NORAC communications, there are specific horn signals tied to different human signals on or near the track. When someone on the ground gives a hand signal to back up, the engineer must acknowledge that signal with the dedicated horn pattern for acknowledging a back-up hand signal. This creates a clear, explicit confirmation that the instruction to back up has been received, reducing the chance of miscommunication in busy or noisy rail environments.

The other horn signals govern different situations: one is a warning used when roadway workers or their equipment are on or near the track; another confirms that a stop signal has been acknowledged (not a fixed signal); and another is the signal used when starting from a standing position. But for confirming a hand signal to back up, the appropriate, recognized horn signal is the acknowledgement specifically for that hand signal.