Would it be possible making the minecart rails on all sides of a block? so under the block and stuff. So it's possible to make a looping and stuff?
Well, from my Point of view, i would say, Probably not how would u be able to stick to the rail under the block? if i'm being harsh, ill stop To be able to do that, try looking up mods? maybe they might have some. I don't use mods, so I don't no any of that. Hope You Find Some!
There are no "upside down" block data types for blocks and/or rails. You will probably end up with floating rails which don't connect properly.