In an earlier contribution to this discussion,
John wrote:

"Arfa Daily" wrote in message
...


I thought that the ones that I had seen, had the grooves in the
moving walkway, slightly off-parallel, so that when the wheel edges
dropped down into them, they 'locked' in place, as gravity tried to
drag them deeper into the diminishing gap ?

Arfa


The ones I have seen also have a claw / sawtooth type feature.


Slightly OT, but at (I think) Zurich Airport they have got luggage trolleys
which can go up and down proper (step-type) escalators - and remain upright!
--
Cheers,
Roger
______
Email address maintained for newsgroup use only, and not regularly
monitored.. Messages sent to it may not be read for several weeks.
PLEASE REPLY TO NEWSGROUP!