The way to ensure no pigmen spawn on your nether rail is to place glass above the rail. This is NOTnot a bug/exploit and will not be "fixed"“fixed”. Glass is a transparent block and will not sufficatesuffocate the riders, but you will need to clear out any areas you may wish to exit the cart at. If you need a walkway, build it beside the track useingusing slabs/halfstepshalf steps (assumeing you need pigmen not to spawn on the walkway aswalkway; they would STILLstill be unable to obstruct the minecart track even if allowed to spawn on the walkway). As
As to powereingpowering the tracks, I would actualy recommend switcheslevers over rtorchestorches. They are hidden if you are not committed to glass on the bottom layer.
N NN
NNN NNON
X_X X_ON
>XX >X-X
> = Lever O = Air - = Slab/halfstep N = Glass