What conditions are crew members advised to look for when an adjacent train is passing?

Crew members are advised to look for overheated journals when an adjacent train is passing because this can indicate that there is a mechanical issue with the train. Overheated journals are a result of excessive friction in the wheel bearings, which can lead to a potential failure if not identified promptly. Recognizing signs of overheating is critical for ensuring the safety of both the passing train and those on the track, as it can prevent incidents related to mechanical failures. This awareness helps in maintaining operational safety and responding effectively to any abnormalities.

In contrast, while the color of the train, length of the train, and schedule adherence might be relevant in other contexts, they do not provide direct information regarding the operational safety and health of the train as it passes. These factors do not indicate potential safety hazards that could require immediate attention or intervention by crew members. The focus on overheated journals allows for a proactive approach to railway safety, highlighting the importance of vigilance in such situations.