That's correct. (That sign could possibly date fro during the reconstruction, when Leeds Whitehall was also in operation.) Leeds Central was a different station, now closed of course, although unlike many other northern stations with 'Central' in the name it was nothing to do with the GCR.
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For those who are wondering what the symbols not mentioned in the article looked like:
(Also I've got a hunch that St Pancras not having one is to do with the fact that it's never actually been owned by Railtrack/NR, just operated by them.)
