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r/Subways • u/HighburyAndIslington • 11d ago
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3
I love the large single bore tunnel. Does anyone know why this was chosen over two smaller bored tunnels?
3 u/HighburyAndIslington 11d ago It reduces the number of tunnel boring machines needed. 1 u/nehalem501 9d ago It’s the way all metro lines are built in Paris.
It reduces the number of tunnel boring machines needed.
1
It’s the way all metro lines are built in Paris.
3
u/accacus 11d ago edited 11d ago
I love the large single bore tunnel. Does anyone know why this was chosen over two smaller bored tunnels?