On Mar 22, 2:17*am, Standing at HN28 signal
wrote:
On 20 Mar, 11:08, wrote:



On Mar 20, 7:58 am, Standing at HN28 signal
wrote:

FCC/TL *won't be using SDO ... they do not use it anywhere on their
network pre-KO0
Yes they will!! The 377/5s are Southern units, built to Southern
specifications. Whether FCC need SDO is not relevant!

) not often I have to comment on one of your respected posts HH28 -
but what I wrote was ''FCC/TL won't be *using* SDO''.

I think I am correct in that, and your comment does not appear to me
to say anywhere FCC/TL are using it, only that the units are
equipped.

Surely that is not so much relevant as THE key point I was respondong
to ... that the Victoria 377 delay sceanrio will not arise at SPILL .

Or can you tell me where FCC/TL will be using SDO underground, and
why ?

With 377s all stations are SDO, so if a 16 car called at a 12 car
platform then the rear 4 won't open.. The train is designed such that
the doors won't release unless I) the train has a GPS fix and knows
what station it is at or ii) an emergency release is given by the
driver. SDO (I doubt) cannot just be disabled as it is integral part
of how the units function.

The GPS part of SDO is not an integral part of how the units function,
it is just a section of the trains' computer programming which limits
which doors that can be opened. The question is how easy it is to
remove the GPS controlled part of program on the 377s as even option
ii) in your list will be too long for the 377s on the Thameslink route
(with several underground stations).