I think part of the reason we're talking past each other here is that you're more focused on the specifics surrounding London's network while I'm trying to make generalizations for rail anywhere in the world...
The only question is how long that time span would be. Gradual changes and incremental improvements + time = radical changes and dramatic improvements
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I trust, of course, that you wouldn't advocate making NO effort to improve the Tube/T/etc?
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Of course not. But things like platform extensions or tunnel reboring can be very difficult.
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Right! So we either do them slowly, or we don't do them at all. I'm advocating the former.
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Though there is an argument for leaving them as they are, with maintenance and limited improvement, and building loads of Crossrails to gradually replace them.
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Seems like a lot of extra cost to maintain and improve existing tunnels while building tons of parallel tunnels to eventually replace them--so long as you're maintaining and improving, why not do so in the direction of making them more Crossrail-like?
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Reboring would be as expensive, and they have lots of inconvenient curves (they follow roads, which also have inconvenient curves).
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...and building new tunnels wouldn't involve a lot of expensive boring?
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About the same cost, I'd have thought.
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