This is a re-post of a signal originally appearing here back on 13 May 2019. I've added a bit more info based on my newly gained 'knowledge' of UK signaling practice. :-) Here's a recap of the Wikipedia article:
"There are two main types of semaphore; stop and distant. The stop signal consists of a red, square-ended arm, with a vertical white stripe typically 9-12 inches (230–300 mm) from the end, and advises the driver whether the line immediately ahead is clear or not. A stop signal must not be passed in the horizontal "on" (danger) position, except where specially authorised by the signalman's instruction. By night, it shows a red light when "on" and a green light when "off" (clear). The green light is usually produced through the use of a blue spectacle lens, which produces green when lit from behind by the yellowish flame from a paraffin lamp."
https://en.wikipedia.org/wiki/UK_railway_signalling
My signal appears to have been made in 1949 from what I could gather and is 9" (22.86cm) H. The base is 3" (7.62cm) W x 3 1/2" (8.89cm) D. Enjoy! Opa Fritz
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