"Peter Masson" wrote in message
...
"John Rowland" wrote in message
...

The obvious solution seems to be individual doors which
check that there is a platform adjacent before opening.

Something along the lines of a transponder at the start
of each platform which is detected by each door and
enables the doors on the appropriate side, and another
one at the end of each platform which disables each door.
Some complications for platforms on reversible lines

Ware springs to mind, and most termini. That sounds high-tech enough to
break down a lot, and requires fitting of kit at stations, which are the
most easily vandalised part of the railway. I was thinking of a projecting
metal arm under each train door which prods the platform.

--
John Rowland - Spamtrapped
Transport Plans for the London Area, updated 2001
http://www.geocities.com/Athens/Acro...69/tpftla.html
A man's vehicle is a symbol of his manhood.
That's why my vehicle's the Piccadilly Line -
It's the size of a county and it comes every two and a half minutes