What action is appropriate if there's smoke coming from affected wheel(s)?

When smoke is observed coming from the affected wheel(s), taking emergency measures to stop the train is the most appropriate action. This response is critical for several reasons.

First, smoke may indicate overheating of the wheel bearings or brakes, which can lead to a fire or failure of the braking system. In such scenarios, it is paramount to prioritize safety and prevent potential accidents that could harm passengers, crew members, or others on the track.

Immediate action to stop the train minimizes the risk of worsening the situation. By stopping as quickly as is safely possible, the crew can assess the problem on-site, ensure that any fire risks are mitigated, and carry out necessary emergency protocols to handle the situation before it escalates.

While checking brake lines or notifying the control center are crucial steps following the emergency stop, they do not address the immediate danger posed by smoke. Keeping the train in motion could exacerbate the issue, leading to more severe consequences. Therefore, stopping the train promptly reflects a proper and safety-oriented response to the observed smoke.