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To fit the necessary elevation changes into the available real estate without excessively steep gradients, and to keep the underwater section as short as practically possible.
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Do you mean the Rotherhithe Tunnel? Someone once told me it's something to do with stopping horses from seeing the daylight at the exit and bolting
gbj_tester
Gregory
@Trunkie
Why are there so many bends in the Blackwall Tunnel?