Signalling System At railway

This document discusses railway signaling systems. It describes that signaling conveys information from station masters to loco drivers about stopping, proceeding with caution, or continuing. There are two main types of signaling systems - time interval and space interval. The time interval method spaces trains over a track based on braking distances, but it cannot handle high traffic volumes. The space interval (block) method divides tracks into sections and only allows one train in a section at a time through the use of visual and audible signals like semaphore arms, color lights, flags, and whistles. Within the space interval method, semaphore signaling uses rotating arms at different angles while color light signaling uses consistent day/night aspects and has advantages