CTRL Signs

What are the blue yellow signs on the CTRL, they have a V turned sideways.

On 19 Jul, 10:08, David Hansen <SENDdavidNOhS...@spidacom.co.uk>
wrote:

> they are where the signals would be if there were trackside signals.

What meaning, exactly, does that convey?

"contrex" <mike.j.harvey@**********> wrote in message
news:7d8b19cd-ecdb-4e65-b7fb-aae74b8cefb5@d1g2000hsg.************.com...
> On 19 Jul, 10:08, David Hansen <SENDdavidNOhS...@spidacom.co.uk>
> wrote:
>
> > they are where the signals would be if there were trackside signals.
>
> What meaning, exactly, does that convey?

A lineside signal identifies the boundary between block sections, and
conveys a permission or prohibition for the train to proceed into the next
section. A repere identifies the boundary between block sections, but the
permission or prohibition for the train to enter the next section is
conveyed by the in-cab signalling.

Peter

On Jul 19, 2:12 pm, "Peter Masson" <peter.mass...@privacy.net> wrote:

> A lineside signal identifies the boundary between block sections, and
> conveys a permission or prohibition for the train to proceed into the next
> section. A repere identifies the boundary between block sections, but the
> permission or prohibition for the train to enter the next section is
> conveyed by the in-cab signalling.

...and presumably also tells a driver where exactly to stop when the
TVM430 screen shows a zero permitted speed (i.e. the equivalent of a
red signal).

"contrex" <mike.j.harvey@**********> wrote in message
news:7d8b19cd-ecdb-4e65-b7fb-aae74b8cefb5@d1g2000hsg.************.com...
> On 19 Jul, 10:08, David Hansen <SENDdavidNOhS...@spidacom.co.uk>
> wrote:
>
>> they are where the signals would be if there were trackside signals.
>
> What meaning, exactly, does that convey?

To my mind, it conveys exactly the same meaning, in layman's terms, as a
previous post reading:

"They are section markers for the TVM 430 in-cab signalling system".

He wasn't disagreeing with you, you know.

Regards

Jonathan

On 19 Jul, 15:36, "Jonathan Morton"
<jonat...@jonathanmortonbutignorethisbit.co.uk> wrote:
> "contrex" <mike.j.har...@**********> wrote in message
>
> news:7d8b19cd-ecdb-4e65-b7fb-aae74b8cefb5@d1g2000hsg.************.com...
>
> > On 19 Jul, 10:08, David Hansen <SENDdavidNOhS...@spidacom.co.uk>
> > wrote:
>
> >> they are where the signals would be if there were trackside signals.
>
> > What meaning, exactly, does that convey?
>
> To my mind, it conveys exactly the same meaning, in layman's terms, as a
> previous post reading:
>
> "They are section markers for the TVM 430 in-cab signalling system".
>
> He wasn't disagreeing with you, you know.
>
> Regards
>
> Jonathan

Rather, clarifying? OK. I just thought I had been as clear as
possible, but I guess maybe I hadn't.

On Sat, 19 Jul 2008 04:48:00 -0700, contrex wrote:

>> they are where the signals would be if there were trackside signals.
>
> What meaning, exactly, does that convey?

From what one DVD on a Eurostar trip said on commentary, the track is
split into sections, and these sections help identify where the train is
specifically if the driver needs to radio where the train stopped. I
would guess this is mostly used for emergencies. I have no idea how far
apart the sensors for the TVM system are spaced, especially compared to
these section markers.

On Tue, 22 Jul 2008 11:16:40 +0100, BH Williams wrote:

> TVM signals are carried by the track circuit, and give a maximum
> permitted speed, rather than being a repetition of signal aspects. These
> speed bands vary according to the type of train, gradient etc, and are
> not directly related to the location of the repere.
<snip>

Thanks for your very detailed reply, none of this was explained in the
commercial DVD, as they were more focused on generalities and the view
from the Eurostar cab.

"Ar" <Ar@127.0.0.1> wrote in message
news:4887b134$0$2519$da0feed9@news.zen.co.uk...
> On Tue, 22 Jul 2008 11:16:40 +0100, BH Williams wrote:
>
>> TVM signals are carried by the track circuit, and give a maximum
>> permitted speed, rather than being a repetition of signal aspects. These
>> speed bands vary according to the type of train, gradient etc, and are
>> not directly related to the location of the repere.
> <snip>
>
> Thanks for your very detailed reply, none of this was explained in the
> commercial DVD, as they were more focused on generalities and the view
> from the Eurostar cab.
Thanks are due to my wife, who has explained it innumerable times at
presentations to the IEE,IET, groups of students etc. Believe me, that was
the simplified, abbreviated explanation......
Brian