First in a series.
That's a good tip. I have a suggestion:
Make two copies of the main track. Copy 1 can be the left hand border, and copy 2 can be the right hand border. With each side being independent of the other, it'll be easy to adjust for tight corners.
But you can use multiple textures and shapes just on one track node.
Most fences have openings before and after corners, otherwise the it would be impossible to get there for help from the officals.
It's a neat idea to have multiple copies of the tracknode, but i don't really see the need for it.