On 11 Jun 2014 13:18:35 GMT
Philip Shaw wrote:
From what I've read on London Reconnections, it seems that TfL has a
policy of no new tubes: all new lines are to be built to main-line
loading gauge. That's for two reasons:

1) Capacity: there's so much supressed demand that any new line worth
building would fill up too quickly.
2) Safety regs: current regs
require a side walkway for new tunnels, and so the tunnel already
needs to be much larger than tube gauage.

That all makes sense. But a self contained metro line is inherently more
reliable that one that relies on the vagueries of the main line railways at
either end. Look what happens to the ELL when it all goes pear shaped in
south london. If there's a balls up on the morgate and KX lines (which wasn't
uncommon when I used to use them) that'll be crossrail 2 stuffed unless
they're planning on giving it its own running lines at the side.

IMO a new "tube" line running S stock or whatever the equivalent would be by
then makes the most sense.

--
Spud