Standing at HN28 signal

On 17 Jul, 20:33, "Chris Read" <chris...@> wrote:
> I was on a down East Coastway service today, 12 car, which stopped at the 8
> car mark at Gatwick Airport.
>
> The driver released the doors (I was in coach 2), before they were hurriedly
> closed again, and the Conductor made an announcement advising pax not to
> alight, as we were not yet fully in the platform and would be pulling
> forward.
>
> With SDO and related GPS gizmos on the 377s, I was wondering, would the
> doors have actually released on the carriages not in the platform? Or are
> the systems not quite that clever?
>
> Chris

Because GPS only knows the location you are at, not exactly where in
that location you are. i.e. it knows you are at gatwick but not which
platform or how far up it you are. SDO only relevant with short
platforms, nothing to do with stop shorts.