Sounds like the termination board from a Temporary Speed Restriction, which tells the driver that this is the end of the temporary restriction section and then can return to normal speed for that line
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RailUK Forums
CC 72100
Peter C
Looking at https://www.railsigns.uk/sect14page2/sect14page2.html, and reading @CC 72100's post above, a 'Termination Indicator' seems to be it.
-Peter
-Peter
CC 72100
That's the one - 'T board' is the semi-official term that is more commonly used.