What best defines an Audible Warning Device in railway safety?

• A. A device used to visually signal trains with lights
• B. A device that emits audible sounds to warn people, such as a whistle, siren, horn or hooter
• C. A device that measures track temperature
• D. A device that records track data

Answer: (B)

An Audible Warning Device is equipment that produces sound to alert people of an approaching train or railway hazard. It relies on hearing the warning rather than seeing it, using sources like a locomotive whistle, horn, siren, or similar hooter to prompt immediate caution or stop. This is different from a visual signal, which uses lights; from devices that measure track conditions like temperature; or from devices that simply record data about the track. The purpose is to deliver a clear, timely alert through sound so people in the area can respond even if visual cues aren’t noticed.