3 ms·
What about digging more parallel tunnels and keeping with smaller stations? That's good for track maintenance too.
by Ericson2314 6y ago
What about digging more parallel tunnels and keeping with smaller stations?
That's good for track maintenance too.
- Schiendelman 6y agoHave you seen the location this is in? That should help answer, you would be trying to dig under skyscrapers.