"Solar Penguin" wrote in message
...

The onboard computer already has a list of stations that the train will be
calling at, for the scrolling electronic displays: "This train calls
at..."
It also has to keep count of which stations it has already called at, so
it
can update the displays each time: "The next station is..."

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.

Dave.