What type of signal is used at congested stations to close-in trains?

The station time signal is specifically designed to communicate the operational status of a train in a congested station environment. Its primary purpose is to indicate to train operators that it is safe or necessary to close in on the train at the platform. This helps maintain an orderly flow of trains and ensures that actions are coordinated, especially in high-traffic areas.

In contrast, a red signal typically indicates a stop, preventing further movement, while warning signals serve to alert operators of potential hazards or conditions that require caution but do not necessarily guide the flow of traffic in the same active way. Flashing light signals may serve various functions, but they often relate to other situation-specific warnings rather than directly managing the movement of trains at congested stations. The station time signal, therefore, is essential for facilitating efficient station operations and ensuring passenger safety while managing the flow of arriving and departing trains.