If there is no red sign displayed at MP4 while the train is within planned work limits, what speed may the train proceed at until RTC confirms no Planned Work effect?

• A. Unrestricted speed
• B. Restricted speed
• C. Stop and protect
• D. Proceed with caution

Answer: (B)

Within planned work limits, trains must operate with caution and be able to stop for any hazard or worker presence. If there’s no red sign displayed at the entry (MP4) into the work zone, the train still must move at restricted speed until the Rail Traffic Controller confirms there is no Planned Work effect. This default speed provides enough margin to react to unexpected conditions in a work area and protects workers, equipment, and the train itself. Unrestricted speed would be unsafe here, and stopping completely or just “proceeding with caution” wouldn’t give the disciplined, defined limit required until clearance is given. Only after RTC confirms no Planned Work effect can the train resume higher speeds.