On Mon, 13 Oct 2014 10:54:44 +0100, Neil Williams
wrote:

A train is a horizontal lift that runs to a timetable. The timetable
would end up in tatters as people who couldn't fit squeezed on, and the
doors wouldn't close, and doors were held all over the place.

I was reading an article about Barcelona's new driverless (and mostly
service-less) lines 9 and 10... Some of the stations are very deep,
and can only have lifts, and it's claimed that these (will) have an
interface with the central system in order to control passenger flows
through the station. If actually done this way, I suppose they would
be vertical lifts that run to a timetable.

Richard.