Pigmen on your tracks? no problem!
Placing half-height slabs above the tracks works. It is too short for pigmen to get under, but doesn't suffocate you while in a cart. Also, because your head is 'inside' of the blocks, you don't see them while riding on the cart. I added a section of 200 on the rail to Maizan's as a test. It seems to be working.
Re: Pigmen on your tracks? no problem!
My shader and resource pack does some crazy stuff with this. I can see the blocks as a two dimensional plane at certain viewing angles (for my toon).
But it DOES work great!
But it DOES work great!
Cuspar