"If we were building the Tube now we'd probably build it like Crossrail" means there is a convergence in form between urban and suburban rail, but that this wasn't known at the time the former was built. Now that we DO know, we build the latter, & retrofit the former accordingly
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About the same cost, I'd have thought.
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soooo why not stick with existing routes then
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No particular reason to if you're spending the money on tunnel boring. And no need to close lines for rebuilding. Plus you can build longer platforms now, since it's not as important to follow streets.
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Fair points, assuming that running a reboring machine through it is the only way to alter the cross-section of a tunnel (which it may well be--I don't know anything about the tech involved for that)
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I don't, but I can't think of a cheaper way. Any tunnel widening is disruptive. Even more so if you need to move the line anyway to extend the platforms.
End of conversation
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