If a train is stopped near an accident or derailment, where must handbrakes be applied?

Applying handbrakes on all the cars of the train is essential for ensuring the safety and stability of the entire train when it is stopped near an accident or derailment. This practice helps prevent accidental movement of the train, which could exacerbate the situation in the event of a slope or if the train is subjected to external forces such as wind or vibrations from passing traffic.

In the context of a stopped train near an incident, it's crucial to account for the possibility that any part of the train could shift unexpectedly. By applying handbrakes to all cars, the operator minimizes the risk of further injuries or damage. This comprehensive approach is a standard safety protocol designed to maintain control and ensure that no cars can roll away, especially in emergency situations where the integrity of the train setup may be compromised.

Focusing on only specific cars, such as those behind the accident or just the leading car or caboose, leaves potential for uncontrolled movement in other areas of the train. Therefore, the safest and most effective measure is to engage the handbrakes on all the cars to provide full protection in such hazardous conditions.