On Sat, 11 Jun 2016 13:47:49 +0100, "
wrote:
On 10.06.16 9:37, Roland Perry wrote:
In message , at 08:28:20 on Fri, 10 Jun
2016, d remarked:
Have they simply not got around to removing them or do they still play
a role
occasionally? Perhaps to let the station staff know when a train can
leave?
Maybe for engineering trains?
I've wondered about this myself, esepcially as neither the Northern nor
Jibilee have wayside signals, save for gap indicators.
IMHO, they simply installed on the Victoria Line a newer and updated
version of the previous system. This mainly starters at stations.
The DTG-R system is completely new and some would say superior to the
Seltrac installed on the other lines (radio, so no wires to get
damaged, better "driving"). As the system uses track circuits, the
colour lights can provide an instant and continuing fallback if the
ATO fails without buggering around with axle-counters. Just a
thought? I'm no expert in it!
According to Wikipedia "LUL claims that this is the world's first
ATO-on-ATO upgrade", which Paris, Barcelona, etc. might have something
to say about.
[...]
Perhaps somebody on the Victoria had the foresight to recognise the
platform repeaters for their aesthetics and thus request modification,
rather than deactivation and replacement with RTDIs?
I agree, they look good. So 60s!
One thing that I don't understand, however, is why they replaced the
waysides with other waysides with three lenses. Could they simply not
have used one lense with LEDs, the way they do on NR?
Interesting, I don't know...
Richard.