What does the illuminated sign signify when indicating the beginning of time control at an indicated speed?

The illuminated sign indicating the beginning of time control at a specified speed signifies that the train is allowed to proceed at that speed. This instruction is crucial for maintaining the schedule and ensuring efficient train operations.

Time control is a management technique used by train operators to keep trains on time. When a sign indicates the start of this control, it informs the engineer that they can safely operate the train at the designated speed, which is typically determined based on the track conditions, signals, and regulatory requirements. Adhering to this speed is important for maintaining overall service reliability and preventing delays.

If the sign indicated a requirement to stop or reverse, or to slow down, it would be counterproductive to the purpose of time control, which is to facilitate timely arrivals and departures. Therefore, understanding this signal is key in the context of train operations and their adherence to schedules.