On Thu, 16 Mar 2017 16:23:18 +0000 (GMT), "Dave Plowman (News)"
wrote:

, could in the future a
collection of vehicles such as driverless cars virtually joined
together be classed as a train with vehicles dropping in and out as
required.

Ever been on a train where it drops off a few carriages? ;-)

No I'm too young.
My Mother remembers going on though and no doubt others of her age
group still do.
Getting in the the wrong section could upset your travel plans .

https://en.wikipedia.org/wiki/Slip_coach

https://www.youtube.com/watch?v=7NEwrjQtrKo

G.Harman