How is a spring switch identified?

A spring switch is specifically identified by a white disc that features the letters "SS" in black. This standard identification helps personnel quickly recognize the presence of a spring switch, which functions differently from a regular switch by automatically returning to a set position due to a spring mechanism. Recognizing these switches is critical for safe operations on the rail network, as it allows employees to be aware of which switches can affect train movements and operations near the track.

The presence of the white disc with the letters "SS" serves not only as a physical marker but as a clear communication signal among train crews and maintenance staff, ensuring a mutual understanding of track conditions. Such standardized markings contribute to maintaining safety and efficiency in a busy rail environment.