"martin.coffee" wrote in message
news
On 12/10/18 08:27, tim... wrote:
Um, how does building a new line to serve a new area create extra
capacity to accommodate growth on the current network?
Because some passengers will start using the new line in preference to the
old one.

the new line doesn't parallel the old one.

It goes somewhere completely different (having shared track for the first
2/3 stations

That's what HS2 is all about.

It's not analogous at all