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Post by GentlemanJim on Sept 7, 2015 17:39:15 GMT
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Post by railtechnician on Sept 8, 2015 4:39:12 GMT
Well known to interested parties this was covered in 'Reconstructing London's Underground' some 40 years ago by the Chief Civil Engineer, Follenfant, but Ian provides more detail, obviously one suspects that which was still securely locked away in the 1970s. One paragraph towards the end of the article struck me; "Old tunnels made from rusting iron rings will collapse eventually, and you wouldn’t want to be in the area when that happened!" There was the potential problem of course with the Bakerloo tunnels under the Thames when we were resignalling the line circa 1988 although I was unaware of it, as were I suspect most people, until we had finished the project. For weeks I walked the tunnels from Embankment to Elephant & Castle and back five nights a week checking the installation of the stick telephones, come-to-telephone signs and cabling which signal new works were installing for me to test and commission. In those tunnels the sounds from the river above were quite audible, later we heard that the tops of the tunnels were exposed above the river bed and concrete was poured to cover them up and protect them. I recall the night we commissioned the complete stick phone installation, it involved remaining in situ under the Thames for some 20 minutes or so as we walked through testing each phone in turn, I had a young manager with me who was not someone who did nights too often and he found it extremely eerie as we waited for a pair of come-to-telephone signs to illuminate. Those particular tunnel sections are not lined with segments but with sheet metal IIRC and joining plates. |
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Post by Nortube on Sept 8, 2015 8:58:23 GMT
There's some more photos on the Ianvisits site: [ Click here ]
There is also some background and technical information on the CX loop, including when it was tunnelled through by the later extension, courtesy of Thames Water (view or download as PDF): [ Click here ]The access from the SB Northern line tunnel to the entrance at the West Intersection can be clearly seen when passing on a train, just before Embankment station. |
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Post by railtechnician on Sept 8, 2015 19:56:03 GMT
There's some more photos on the Ianvisits site: [ Click here ]
There is also some background and technical information on the CX loop, including when it was tunnelled through by the later extension, courtesy of Thames Water (view or download as PDF): [ Click here ]The access from the SB Northern line tunnel to the entrance at the West Intersection can be clearly seen when passing on a train, just before Embankment station. Of course the mentioned Engineer article(s) 1926 are available online too. |
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