What kind of conditions can a Trackside Warning Detector identify?

Trackside Warning Detectors are specifically designed to monitor and identify critical conditions that can affect the safety and integrity of rail operations. One of their primary functions is to detect overheating bearings, commonly referred to as "hot boxes." When a wheel bearing or journal exceeds a certain temperature threshold, the detector will issue a warning to alert train crews and maintainers about potential equipment failures before they lead to significant accidents.

In addition to detecting overheated journals, these detectors can also pick up on other equipment issues, such as axles that are not functioning properly, loose or damaged components, or any abnormalities in the train's mechanical systems that might pose a risk. This capability is vital in ensuring the continued safety of rail operations and helps prevent accidents caused by mechanical failures.

The other options relate to aspects of rail operation that are typically monitored by different systems or protocols. For instance, passenger safety concerns would be managed through other safety systems and operational policies, unforeseen changes in train speed would be monitored by the train's onboard systems, and signal discrepancies are addressed through signal maintenance and inspection procedures. Therefore, the primary role of Trackside Warning Detectors firmly aligns with monitoring for overheated journals and related equipment issues.