"Peter Masson" wrote in message
...

"Lüko Willms" wrote

Why and how would the Class 92 locomotives have to be "configured
for HS1"? They do support TVM and KVB, don't they?

I think they only have it configured for the Channel Tunnel, which uses
different speed bands from HS1 or LGV. ISTR that when one freight train
was
allowed to use the CTRL it had to do so under special regulations as it
was
effectively unsignalled.

Peter


The TVM configurations are specific to route and stock, as they include the
braking curves for given items of stock under given conditions. In some
instances, a temporary change in braking characteristics may be accomodated
by following a given set of speed restrictions viz the TVM indications shown
in cab. A shuttle rake with a certain number of wagons whose
electro-pneumatic brakes are isolated might only be allowed to travel at 110
kph when the cab indication is 140 kph, for example.
There is also an element of 'route-barring', such that a Shuttle routed in
error towards LGV Nord at the French Portal, or a E* routed towards the UK
terminal loop, would receive a 'stopping sequence' on the in-cab display.
When such a movement has to be carried out- for example when there were
three Class 92 hauled freights conveying out-of-gauge wagons to the UK for
road transhipment- the options are either to give the driver a 'FREP' ( a
numbered message which has to be read out by the signaller and repeated back
by the driver) for each signal or to class the entire route as a work-site
and authorise the driver to proceed at 'marche-a-vue' (a speed at which the
train may be stopped short of any obstruction, with a normal maximum of 40
kph, IIRC) as far as a given 'repere' or other stopping point. Neither is
suitable for 'normal' operation, as you may well imagine. The several
freights that had to use CTRL1 due to an engineering possession on the
normal route via Sandling (3rd/4th April 2004, see
http://www.ews-railway.co.uk/cmsystem/news_article.asp?guid={1550A404-25E1-4384-962C-4887BF3C7C09})
were 66-hauled,I believe, as various CTRL works meant there was no juice
from Dolland's Moor.
The 92s do not have KVB, unless some of those acquired by Europorte have
been so fitted- I shall enquire- but do have BR AWS/TPWS.
Should anyone seek a more in-depth explanation of TVM, I would recommend
page 80-83 of Brian Perren's TGV Handbook.
regards
Brian