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JLE signals await millennium

JUBILEE LINE Extension project director Hugh Doherty this week indicated that the much delayed moving block signalling technology was now unlikely to be installed on the new line before 2001.

Ongoing development problems forced JLE to shelve plans for the high- tech software driven system last February and install a modified fixed block system to get the Tube link between Green Park and Stratford in east London opened by spring 1999. This will limit the service to 24 trains per hour.

Doherty confirmed that the priority was now to get the fixed block system working and said: 'We will be doing some testing on the moving block system in 1999, but just how far beyond the millennium we will be able to bring in the system remains to be resolved.'

But he added that as the New Millennium Exhibition Company was relying on the service to transport hundreds of thousands of visitors to Greenwich pennisula each week throughout 2000, London Underground was reluctant to install the new system until it was sure it would not fail.

Doherty also said that London Underground had, in hindsight, been over- optimistic in its desire for the new signalling technology. 'There was a substantial amount of development work associated with the product. The real solution would have been to rely on known technology and bring in the moving block system when it was ready' (see page 14).

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