"Brian Watson" wrote in message ...
I'd like to put up a fence with tops on the vertical members that are more
interesting than simple triangular peaks or semicircles. Something like the
pelmets round an old fashioned station's platform canopy, but inverted of
course to make the fence, is what I have in mind.

I think that you should remember that the fancy valences on railway
platform canopies served a purpose, as well as being decorative. They
were designed to encourage rainwater to run off to the tips, avoiding
rot.

It may be that such a design, inverted and used for a fence, tends
towards the opposite, and is prone to rot.