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Bakerloo line tunnel
I took my first ride on the bakerloo line for years this morning and I noticed
that southbound from charing X to waterloo the tunnel lining suddenly changes into rather old looking concrete for a fair distance. Is this due to WW2 bombing or something else? The iron rings resume just before waterloo. |
Bakerloo line tunnel
wrote in message ... I took my first ride on the bakerloo line for years this morning and I noticed that southbound from charing X to waterloo the tunnel lining suddenly changes into rather old looking concrete for a fair distance. Is this due to WW2 bombing or something else? The iron rings resume just before waterloo. I believe that the sections of the Bakerloo Thames tunnels in gravel were lined in the 1920s with a steel liner, the gap inbetween the liner and the original cast iron segments being filled with concrete. Later on (1940s), when the track base was being rebuilt (in concrete) the steel liner was removed. The 1920s work was meant to stiffen and improve waterproofing in the tunnel. I guess that it was thought that the enhanced concrete on its own could do the job. Further work was carried out in the 1990s, though that was mostly to prevent undermining of the tunnel (?) The WW2 under-Thames casualty was the direct hit on an unused bit of the Northern line. PA |
Bakerloo line tunnel
Peter Able wrote on 12 Mar 2018 at 19:27 ...
wrote in message ... I took my first ride on the bakerloo line for years this morning and I noticed that southbound from charing X to waterloo the tunnel lining suddenly changes into rather old looking concrete for a fair distance. Is this due to WW2 bombing or something else? The iron rings resume just before waterloo. I believe that the sections of the Bakerloo Thames tunnels in gravel were lined in the 1920s with a steel liner, the gap inbetween the liner and the original cast iron segments being filled with concrete. Later on (1940s), when the track base was being rebuilt (in concrete) the steel liner was removed. The 1920s work was meant to stiffen and improve waterproofing in the tunnel. I guess that it was thought that the enhanced concrete on its own could do the job. Further work was carried out in the 1990s, though that was mostly to prevent undermining of the tunnel (?) The WW2 under-Thames casualty was the direct hit on an unused bit of the Northern line. There was also an incident in 2012 when a Bakerloo train "hit a tunnel", which I think meant that some extremity on the train hit a piece of quick-dried cement grout that had been applied in overnight maintenance, but had oozed out before it had dried. See https://www.telegraph.co.uk/news/ukn...asualties.html -- Richard J. (to email me, swap 'uk' and 'yon' in address) |
Bakerloo line tunnel
On Mon, 12 Mar 2018 21:40:18 +0000
"Richard J." wrote: Peter Able wrote on 12 Mar 2018 at 19:27 ... The WW2 under-Thames casualty was the direct hit on an unused bit of the Northern line. There was also an incident in 2012 when a Bakerloo train "hit a tunnel", which I think meant that some extremity on the train hit a piece of quick-dried cement grout that had been applied in overnight maintenance, but had oozed out before it had dried. See https://www.telegraph.co.uk/news/ukn...228164/Bakerlo -line-suspended-after-tube-hits-tunnel-no-casualties.html FTA: "Geoff Martin, an RMT spokesman, said: "There has been a build-up of rain water behind the tunnel wall and on the ceiling of the tunnel as well. " Rain from when, the ice age?? Another RMT rocket scientist keeping us informed. |
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