Clive Page wrote:
On 21/11/2016 22:38, Recliner wrote:
The article includes a picture, but I think mine is clearer:

https://www.flickr.com/photos/reclin...6665/lightbox/

It is, thanks. It says that they will support a foot, but what if you
wheel a heavy suitcase across, do the wheels get supported or fall into
the gap? I'd have expected the force per unit area would be quite a lot
higher.

I think the teeth are much deeper than they are wide, so they wouldn't bend
down. They'd bend sideways if enough weight was put on them, but I think a
wheely case should be fine. They'd also reduce the chance of something
(phone, camera, hand bag, water bottle) being accidentally dropped on to
the tracks through the gap