From my admittedly short bit of reading about the signal system in the UK - as it pertains to these semaphore type signals - was comprised of two types: stop and distant (I've noticed that Hornby markets the "stop" semaphores as "home" signals, so there is apparently at least two different names for the same type of signal). The one I currently have on the layout is the "distant" signal which is comprised of a yellow arm with a notched end and a correspondingly 'notched' black arrow type marking. I'll let Wikipedia describe it's purpose:
"The other type is the distant signal, which has a yellow arm with a 'V' ("fishtail") notch cut out of the end and a black chevron typically 9-12 inches (230–300 mm) from the end. Its purpose is to advise the driver of the state of the following stop signal(s); it may be passed in the "on" position, but the driver must slow his train to be able to stop at the next stop signal. When "off", a distant signal tells the driver that all the following stop signals of the signal box are also "off", and when "on" tells the driver that one or more of these signals is likely to be at danger. By night, it shows a yellow light when "on" and a green light when "off". On many branch lines and short block sections, a distant signal was often fixed at 'Caution', standalone or mounted below a Stop semaphore, and so exhibited only a yellow light at night."
...and there you have it. My signal measures 10" (25.4cm) H. Base = 3 3/4" (9.52cm) D x 2 3/4" (6.98cm) W. Enjoy! Opa Fritz
I must've ben bored to take this many photos! LOL I mean, it's my usual course of 12 shots but really?
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