On 20 Jun, 12:28, David Cantrell wrote:
With these things taking all kinds of unusual routes, how do they cope
with the need for the driver to have route knowledge? Keep changing
drivers all over the place?

Perhaps theres some low maximum speed and train weight below which a
driver can drive any route because he'll be able to pull up before he
reaches any red signal after first seeing it?

B2003

On 20 Jun, 14:15, Boltar wrote:
On 20 Jun, 12:28, David Cantrell wrote:

With these things taking all kinds of unusual routes, how do they cope
with the need for the driver to have route knowledge? Keep changing
drivers all over the place?

Perhaps theres some low maximum speed and train weight below which a
driver can drive any route because he'll be able to pull up before he
reaches any red signal after first seeing it?

B2003

Conductors?

"Surely the clearances arn't *that* tight? Besides , didn't they
extensively rebuild that part of the tunnel in the last few years?
Perhaps they improved the clearances while they were at it and these
restrictions no longer apply. "

Whilst work may have happened on the southern end of the new
Thameslink station box at St Pancras, where the track is relatively
straight, I am not aware of any work on the reverse curves (the Hotel
Curves) between KX Thameslink and the new station box. These are, I
believe, the main constriant to the route clearances.

BTW how do you improve clearances in a brick tunnel under a builidng,?

OC

In article . com,
(Old Central) wrote:

"Surely the clearances arn't *that* tight? Besides , didn't they
extensively rebuild that part of the tunnel in the last few years?
Perhaps they improved the clearances while they were at it and these
restrictions no longer apply. "

Whilst work may have happened on the southern end of the new
Thameslink station box at St Pancras, where the track is relatively
straight, I am not aware of any work on the reverse curves (the
Hotel Curves) between KX Thameslink and the new station box. These
are, I believe, the main constriant to the route clearances.

I think it's Midland Curve. Hotel Curve is the GN connection now
abandoned. IIRC the main constraints were in the GN rather than the
Midland tunnels.

BTW how do you improve clearances in a brick tunnel under a
builidng,?

With difficulty?

--
Colin Rosenstiel

Doh! Of course it is not the Hotel Curves. The constraints in the
Midland tunnels are significant.

With even more difficulty I suspect if there is a Grade 1 listed
structure on top.

OC

In article .com,
(Old Central) wrote:

Doh! Of course it is not the Hotel Curves. The constraints in the
Midland tunnels are significant.

With even more difficulty I suspect if there is a Grade 1 listed
structure on top.

The Midland Curve tunnel is double track and nothing like as bad as the
King's Cross Hotel Curve and York Curve tunnels were.

--
Colin Rosenstiel