3 ms·
The economics were much different when digging out tunnels by hand with tunneling shield. The other factor is that stations tend to be the big cost because the
by ianburrell 3y ago
The economics were much different when digging out tunnels by hand with tunneling shield.
The other factor is that stations tend to be the big cost because they are dug separately. The Vegas system has a ton of stations, and I haven't seen any reason why those would be cheap.