D7666 wrote on 05 December 2009 20:20:33 ...

[snip]
Digressing, PEDs on the Jubilee were not put there for safety - they
are there because the JLE has a tunnel ventilation system. I am of the
understanding that TV is - if not a requirement of new underground
lines - the only means to meet certain other conditions such as
smoke evacuation and/or environmental conditions. Crossrail is having
PEDs for that reason - not platform edge safety (even if the media
people have dressed it up otherwise). I am certainly of the
understanding that Paris stations with PEDs are also for TV
relief, not platform/train safety.

Re Paris: It's possible that the PEDs on line 14 were for both
purposes. But the PEDs now being installed at every station on line 1
have been presented to the public as being necessary for the
introduction of unmanned trains. I can't think of any other reason for
them.

--
Richard J.
(to email me, swap 'uk' and 'yon' in address)