Description
This design of signal arm dates from around 1930 as a replacement for the extant wooden arm on a square wooden post style. It was used for new installations (on tubular steel posts) and renewals (often on new steel posts, but sometimes on the original wooden ones) until the end of the GWR period, and by the Western Region of British Rail(ways). Many examples are still in use today, and new ones are still being installed where replacement by colour lights is inappropriate.
