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Looking closer, yes, there's the short section of rail on a wharf by the canal that's long made me curious:
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It looks like this little bit of line was separate to the currently running stretch, could well have been a separate company, even. The remains of industry fascinate me, especially when largely forgotten; it would be great to try to search out other remains of this second line, but for the mean time I can only look at maps online:
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The route of the standard gauge brach is clearly visible; by it's very nature, 'light' railway was pretty much emphemeral and made less of an impact on the land.
Edited to add - Carrie's sent me a picture of the wharf itself, looking pretty much ready for a few trucks to be rolled in:
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