What are Peco Code 100 "Catch Points" ?

In looking into which track I might use, the Peco website lists “Catch Points” , I’ve never heard of them, they look like an incomplete switch, what are they used for, what’s their purpose?

here is a link to them

http://www.peco-uk.com/imageselector/Files/Track-templates/SL-84,85.pdf

David

Also known as a split-rail derail, it is used to derail runaway equipment before it makes it to the mainline,thus preventing even more damage.

Discussed on this forum a few times, here’s one thread:
http://cs.trains.com/TRCCS/forums/t/157708.aspx

Thanks guys

David