Well, since this is Magic I really think flying carts would be cool. A vertical cart elevator would certainly be very cool. Perhaps there could be special carts that float, and do not need rails? They would simply keep going in the direction of the last rail, and you'd only need rails to change directions/stop the cart. With upgrades, they could go up vertical inclines by themselves.
what about a arcane levitator track for both up and down also
other ideas
academical furnace carts maybe make the compatible with hopper carts
a way to link hopper carts to another
alchemical furnace carts
void jar carts pipes carts
a way to run pipes to supply different things with essentia
not sure if they have been mentioned but magic mirror carts
some type of essentia magic mirror cart
so i can set up a system to use the arcane bore cart that feeds into the infernal furnace cart and produces all the essentia needed all in a train