On Tue, 8 Aug 2017 02:40:15 -0700 (PDT), Ding Bat
wrote:

On Tuesday, August 8, 2017 at 12:53:09 PM UTC+5:30, Recliner wrote:
Ding Bat wrote:
On Sunday, August 6, 2017 at 4:29:45 PM UTC+5:30, Recliner wrote:
Ding Bat wrote:
On Thursday, August 3, 2017 at 2:06:46 PM UTC+5:30, wrote:

As an aside, how do trains on the ECML get south of the river, where's
the link to the current thameslink route?

Trains from the north either terminate at King's Cross or go to a through
station under St Pancras. To reach the latter, a tunnel was burrowed under
the canal to the north of St Pancras.

The two Canal Tunnels, actually, built over a decade ago.

They're unfortunately named. A canal tunnel used to be for waterborne
vessels.
https://en.wikipedia.org/wiki/List_o...United_Kingdom

I agree, and it's also a rather ambiguous name: one that linked it to the
area might have been better (eg, St Pancras tunnels?).

I was referring to the one for north to south traffic;
obviously, there's another for the other direction.

Well, it might have been a double-track tunnel.

Tunneling today is done with an automated mole having a circular cross section,
so a Paris style semi-circular tunnel for double-track is impracticable.
Where does London have multi-track tunnels? Snow Hill? The route of the
former Circle Line? FWIW, the Canal tunnels' portal is double-track.

That's true of most Tube tunnel portals, as the initial shallow
section is cut and cover. The TBMs only do the deep tunneling.

All of the sub-surface LU line tunnels are cut and cover. That's not
just the Circle line, but the Met line to Finchley Road and the
District line tunnels in East London. The Piccadilly line tunnel to
Hatton Cross is also shallow cut and cover double track. All of the
old mainline railway tunnels are also cut and cover, and usually
double track. Even the Brunel ELL Thames tunnel, though obviously not
cut and cover, is double-track. I've not seen an analysis, but there
must be almost as much double track tunnel in central London as deep
bore single track tube tunnels.