On Feb 21, 8:47*am, "
wrote:
On 20.02.10 21:28, John wrote: Cab signalling would not work for NLL at the current time because the
route is used by so many trains which are not fitted. The costs of
fitment would be very high.

ELLX would have been a good route to try it on with all new trains, but
I think they decided the technology was not mature enough when they had
to let the contracts.

In ,
*writes
I wonder if they considered new types of signalling on the NLL, such as
cab signals. Did they consider that at all on the ELLX?

That technology has been around since the 1920s and is widely used in
other nations.


But not normally on tracks shared with other services.

They could have started with the ELLX, since it won't really interact
with the NLL.


Whilst the extended ELL will be separate from the NLL, it will still
be running over large stretches of shared track south of Surrey Quays.

If it works out, then perhaps they could start considering the NLL in
phases. I know that they plan to be rid of goods trains on the line, but
trains can also be fitted with cab signals. They don't have to be *built
in when the units are being constructed.

There is no plans to remove freight traffic from the NLL, in fact much
of the work to increase capacity between Camden Road and Stratford is
purely for the freight, with long loops etc. being added.

John wrote:
In article , Paul Scott
writes
John wrote:
Cab signalling would not work for NLL at the current time because
the route is used by so many trains which are not fitted. The costs
of fitment would be very high.

ELLX would have been a good route to try it on with all new trains,
but I think they decided the technology was not mature enough when
they had to let the contracts.

That could apply to the core route, but the extensions over NR
routes would have then required dual fitted trains, for the same
reasons as you point out for the NLL.

Paul S


But a cab equipped train can run over non cab equipped lines (look at
Eurostar for an example).

Course it can, but why bother? Surely it is just a waste of money to have
cab signalling on a minority of the route. The interface between London
Bridge and New Cross signalling centres would presumably be more complex as
well - another expense with no benefit.

Paul S