From a ride I did 2 years ago, ,the descent into Wellesbourne from the fosse way.
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Blimey Dave, ridden down there a few times (being a Coventry boy who then lived in Southam from 1991 to 2006 (when I moved down here).
This is actually a bridge over a former narrow gauge railway which ran through the bog and alongside the road through the mountain pass.
Which railway was that?