On Tue, 24 Mar 2009 20:49:14 -0000, mark wrote:

The warning says something like: Will come to a Sudden Stop at the Red
Line.

How does that work?

Must have posh trollies if they have an electical automatic braking sytem,
either that or an awful lot of tea leaves to make such a system worth
while.

What I have seen is attachments to the wheels and section of floor that
engages on the attachments stoping the trolly going any further. I've also
seen this used on an escalator for people and trollies. No steps just a
flat moving ramp push trolly on it locks to the surface you and it ride to
the top where fingers lift the trolley off the surafce and away you go.

As for lifting a trolley, they are pretty heavy empty and one assumes
people "borrow" them when full to assist in moving their shopping.

--
Cheers
Dave.