On 2011\08\19 10:52, MaxB wrote:
"Basil Jet" wrote in message
...

http://www.bing.com/maps/?v=2&cp=skb...=b&form=LMLTCC


It looks like there are two air holes in the middle of the picture.
Why would such short tunnels have air holes?

You can (just) see them from Google Street View, best from east end, but
doesn't provide any explanation. Not the usual sort of shape for steam
holes I would have thought but of course they must be very short.

Come to think of it, this tunnel must be cut and cover, although I'm not
entirely sure why it was covered at all. 1880 maps show the tunnel as
already being there. The appearance of the shafts in Streetview seems
modern.