How should an engineer respond to a hotbox detector alarm?

When a hotbox detector alarm is triggered, it indicates that one or more wheel bearings on the train may be overheating. This is a critical safety concern because overheated bearings can lead to equipment failure, derailment, or serious accidents. Therefore, the appropriate response is to bring the train to a stop and inspect the affected wheel bearings to assess their condition.

By stopping the train, the engineer allows for a thorough examination of the bearings and ensures that any potential issues are addressed before proceeding. This precautionary measure prioritizes safety over speed and helps prevent further damage to the train or possible accidents.

Continuing at the same speed, notifying passengers, or increasing speed would not address the potential safety hazard that the hotbox detector alarm signifies. These actions could exacerbate the situation, putting passengers and equipment at risk. Thus, stopping the train to conduct an inspection aligns with proper safety protocols in response to such alarms.