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Kingsway Tram Subway in 4mm:1ft (OO) scale, seen at Trainwest 2007
Down the 1-in-10 gradient of the Southampton Row entrance you can see Holborn station in the distance (rather closer than scale!)
http://www.subbri t.org.uk/sb-sites/si tes/k/kingsway_tram_ subway/
http://www.underg round-history.co.uk/ kwupass.php
