HS1: is there a published gradient profile?

[S&CLER]

Yesterday I picked up a copy of Ken Cordner's 2008 book Tunnel Vision, about the construction of HS1. It is an interesting read with excellent photographs, but surprisingly no gradient profile. I haven't seen one in any other publication on the Tunnel/CTRL either. Can anyone point me to a published gradient profile? Cordner says tantallsingly that only 2.8 miles of the whole route from St Pancras to the tunnel are level.

It may also interest those in the area that I bought the book from the very cheap Samaritans bookshop in Colne market and noticed that they are having a railway books and mags event on 21-22 January.

 

[civ-eng-jim]

Here you go:

I had a quick skim through and could only see 2.46miles of level track.

 

[S&CLER]

Here you go:

I had a quick skim through and could only see 2.46miles of level track.

Many thanks. I thought the Chatham line was quite a saw-tooth, and one of the most difficult of the main lines from London, but HS1 beats it; of course its curvature is incomparably better than the LC&D.

 

[notadriver]

You can see some lengthy 1 in 40 gradients going into the Thames Tunnel only slightly less than the 1 in 37 of the Lickey.

 

[Legolash2o]

Where exactly does 0km start? The end of the platform at St Pancras or at the tunnels near York Way Jn?

 

[civ-eng-jim]

Judging by the 0.442km marker on the end of the international platforms, I'd imagine it was the buffers on Platforms 5-10

 

[Legolash2o]

Judging by the 0.442km marker on the end of the international platforms, I'd imagine it was the buffers on Platforms 5-10

View attachment 108864

Thanks

== Doublepost prevention - post automatically merged: 17 Jan 2022 ==

Is there a similar diagram for beyond Dollands Moor Yard please? Hopefully it'll show the channel tunnel itself.

 

[rob365]

Judging by the 0.442km marker on the end of the international platforms, I'd imagine it was the buffers on Platforms 5-10

View attachment 108864

Correct, 0.000km is the buffer stops for P5-10. P11-13 start at 0.228km

== Doublepost prevention - post automatically merged: 21 Jan 2022 ==

Thanks

== Doublepost prevention - post automatically merged: 17 Jan 2022 ==

Is there a similar diagram for beyond Dollands Moor Yard please? Hopefully it'll show the channel tunnel itself.

Layout diagram here, but can't find topography.

 

[LNW-GW Joint]

This diagram gives an idea of the vertical alignment of the tunnel: from Channel Tunnel: Construction of the World's Longest Underwater Tunnel - The Constructor



I thought a 2% gradient (1 in 50) was part of the design for the land tunnels to reach the main undersea section, and this therefore determined the specification for the traction used on tunnel services, with the need for one loco to haul a complete train (shuttle/freight) out of the tunnel.