On Apr 15, 6:56*am, "Clive D. W. Feather" cl...@on-the-
train.demon.co.uk wrote:

Do either of you know what's on the plate? The PDF seems to show
three rows of text.


I'm not certain, but I think it's "GB507" over "LOS" over a right-hand
arrow.

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Railway Signs and Signals of Great Britain:
http://www.railsigns.co.uk/