Which types of trains may require protection?

Protection is a critical safety measure in railway operations, particularly when it comes to managing risks associated with trains that encounter unexpected issues. The types of trains that require protection primarily include those that have become delayed, stalled, failed, or derailed. Each of these situations poses unique dangers not just to the affected train but also to surrounding trains and rail infrastructure.

Delayed trains may block tracks or create hazards when other trains are approaching, necessitating protective measures to prevent collisions. Stalled or failed trains can halt operations on vital sections of the track, requiring the movement of other trains to be managed carefully to avoid accidents. Derailed trains represent significant safety hazards and can obstruct tracks entirely, demanding immediate protection to ensure the safety of other trains and crews working nearby.

Other train types, such as passenger or freight trains in normal service, generally do not require additional protection unless they encounter similar issues. Therefore, the focus on stalled, failed, or derailed trains successfully highlights the specific circumstances that necessitate protective measures to ensure safety on the rail network.