On 31 Aug, 11:23, Kev wrote:
Opened in 1999. Are you sure it's 'replaced' rather than
'refurbished'? It wouldn't surprise me especially if the escalators
need 6 weeks of heavy maintenance after nearly 10 years' service, and
6 weeks sounds definitely more like a 'maintenance' than a
'replacement' timescale (iirc it's at least 3 months to install a
wholly new escalator into an existing shaft).

They replaced the escalators at North Greenwich also. Let's not
mention the replacement signalling system.The JLEx sure must have been
a pile of ****e.

Again, no they didn't. *Replacing* escalators is a year-long process -
see this interesting piece on the escalators at Moorgate:
http://www.metronetrail.com/default....=1125646086750

What they're doing here is refurbishing:
http://www.tubelines.com/news/perfor..._Q1_2007-8.pdf

I don't know if you've ever worked in manufacturing industry, but if
you can find a complex electromechanical machine that works non-stop
for eight years and doesn't require a shutdown for refurbishment and
extended maintenance, then I'd be interested to see it...

As far as the signalling goes - this was an emergency stopgap after
the oh-so-clever technology originally planned (but never previously
made operational anywhere, ever) failed to work. The plan was always
to replace it as part of the line upgrade.

--
John Band
john at johnband dot org
www.johnband.org