What is the maximum speed a train can proceed at once it reaches a restricted area indicated by a yellow flag?

A train must adhere to the speed specified by the track warrant, track bulletin, general orders, or any radio speed restriction when it reaches a restricted area indicated by a yellow flag. This rule is designed to enhance safety in areas where signals are not clear and conditions may require extra caution. The yellow flag serves as a warning, indicating that the train should reduce speed based on the provided instructions, which could vary depending on the situation or location.

Factors that determine this speed can include temporary track conditions, work being done on or near the tracks, or any other factor that the railroad has deemed necessary for safe operations. By adhering to the predetermined speed limits specified in these documents, train crews can ensure the safety both of their train and of any personnel or equipment that may be affected by the train's passage through the area.