When is foul time considered to be in effect?

Foul time is considered to be in effect immediately upon request. This means that as soon as personnel communicate their need for foul time, it is recognized and understood that the track is to be cleared of any potential obstructions or hazards. In this context, foul time refers to the time period in which work is being done on or near the tracks, during which trains should not be allowed to move through the area without the proper authorization.

This understanding is critical for maintaining safety during on-track activities. Personnel must communicate promptly and effectively to ensure that all relevant players, including the dispatcher, are aware that foul time has been established for safety reasons.

In this scenario, the acknowledgment of foul time does not require waiting for an external signal, such as the arrival of the dispatcher or an "OK" time, thus making it immediately effective upon request. This ensures that work can commence safely and provides clarity to all parties involved.