--- "Dave Liney" wrote:


Just use that information to decide whether or not to open the doors
at each station. Problem solved.

Until a security alert closes a station so the train doesn't stop there
and then the count is off by one.


So how does it keep the count of "The next station is..." displays updated
when that happens? Presumably the driver just presses a button (or a
touch-screen display or whatever) to update the count and let it know the
train's not stopping. Or maybe the signal box does it by remote control.
Or something.

The details don't matter. The important thing is that there already has to
be some way of keeping the station count updated even when GPS isn't
working. So why not use that for the doors as well?