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There is also the Glasgow Subway [0] which uses 11 ft diameter tunnels [0] https://en.wikipedia.org/wiki/Glasgow_Subway https://en.wikipedia.org/wiki/Glasgow_S
by pantalaimon 3y ago
There is also the Glasgow Subway [0] which uses 11 ft diameter tunnels
[0] https://en.wikipedia.org/wiki/Glasgow_Subway https://en.wikipedia.org/wiki/Glasgow_Subway