What do the numerals on the signal mast of a switch indicator represent?

The numerals on the signal mast of a switch indicator specifically denote the number of facing point switches that are connected to that particular signal. This information is crucial for train crews, as it indicates how many switches need to be lined and confirmed in the correct position before a train can proceed. By providing a clear and concise representation of the switch configuration associated with a signal, the numerals help maintain safety and operational efficiency, ensuring that train operations are conducted without errors.

Thus, when a crew sees a specific numeral, they know exactly how many switches they must check, allowing for a streamlined process during train movements and minimizing the chances of miscommunication or oversight involving switch settings.