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New tube map has mistake
Roland Perry wrote:
In message -sept ember.org, at 08:20:54 on Thu, 31 May 2018, Recliner remarked: London Underground in 1995, were claiming St Pancras would open for Channel Tunnel traffic in 2002 and the Jubilee Line extension to Stratford by 1998. That was close: it opened in 1999. "Construction officially started in December 1993, expected to take 53 months [#8, which is Hansard June 1993]." (Wikipedia) 1/1/93+53mths = Jun97; thus I suspect the "by 1998" above was an attempt to convey "might slip to the end of 1997". Er, Dec 1993 isn't 1/1/93. 53 months after Dec 1993 would be April 1998. I'll give the benefit of the doubt to Wikipedia that subsequent dates quoted are a correct reflection of the cites... "By November 1997 a September 1998 date was planned.[10] By June 1998, opening was planned in Spring 1999.[11] By November 1998, a phased opening, previously rejected, was being considered, with Stratford to North Greenwich planned for spring 1999, to Waterloo for summer 1999, and the link to the Jubilee line for autumn 1999.[12][13] This scheme was followed, with the first phase opening on 14 May 1999, the second on 24 September, and the third on 20 November. Westminster, complicated by the interface with the subsurface platforms, which remained in operation, opened on 22 December 1999, shortly before the Millennium Dome deadline". So yes, a gentle slide, rather than a major calamity. The bigger slippage was the signalling. The originally planned moving block signalling had to be hurriedly replaced by conventional signalling so as to get the extension open during 1999, just in time for the hard deadline of the midnight party in the big tent. In fact, they only got the moving block signalling working in mid 2011, just before the next hard deadline of the London Olympics: http://www.risktec.tuv.com/knowledge-bank/technical-articles/sending-the-right-signals---new-signalling-technology-for-the-jubilee-line.aspx |
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New tube map has mistake
In message
-sept ember.org, at 10:17:43 on Thu, 31 May 2018, Recliner remarked: Roland Perry wrote: In message -sept ember.org, at 08:20:54 on Thu, 31 May 2018, Recliner remarked: London Underground in 1995, were claiming St Pancras would open for Channel Tunnel traffic in 2002 and the Jubilee Line extension to Stratford by 1998. That was close: it opened in 1999. "Construction officially started in December 1993, expected to take 53 months [#8, which is Hansard June 1993]." (Wikipedia) 1/1/93+53mths = Jun97; thus I suspect the "by 1998" above was an attempt to convey "might slip to the end of 1997". Er, Dec 1993 isn't 1/1/93. 53 months after Dec 1993 would be April 1998. True, I really meant 1/1/94 (I doubt they did much over the Xmas break), so we appear to have converged on "by the end of Q2 1998". I'll give the benefit of the doubt to Wikipedia that subsequent dates quoted are a correct reflection of the cites... "By November 1997 a September 1998 date was planned.[10] By June 1998, opening was planned in Spring 1999.[11] By November 1998, a phased opening, previously rejected, was being considered, with Stratford to North Greenwich planned for spring 1999, to Waterloo for summer 1999, and the link to the Jubilee line for autumn 1999.[12][13] This scheme was followed, with the first phase opening on 14 May 1999, the second on 24 September, and the third on 20 November. Westminster, complicated by the interface with the subsurface platforms, which remained in operation, opened on 22 December 1999, shortly before the Millennium Dome deadline". So yes, a gentle slide, rather than a major calamity. The bigger slippage was the signalling. The originally planned moving block Biggest cause of the slippage, perhaps, but every project will have one of those, and it's failing to allow for that inevitability which is the downfall of most such early predictions. -- Roland Perry |
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