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Ah yes, Chesterfield tunnel. The southern portal is still visible, even if surrounded by massive concrete walls beside the "new" road. I attach a (slightly faded) photo of it which I took around 1972. The actual tunel portal has a standard rounded top which I assume was always hidden by the road (now demolished at that point) shown in the photo. On a recent visit to Chesterfield I had trouble establishing exactly where the northern portal used to be. Armed with a reasonably accurate GPS and old large scale map, the position would perhaps seem to be almost over where the new road is now but I'm not sure. There is a big square concrete block beside the road, visible even on Google Earth, which evidently gives access to the tunnel but whether it's exactly over the portal or they cut just into the tunnel, I don't know.
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