How do you go about making roller coasters that don't glitch out?

[Intended_Pun]

I had a similar question a few weeks ago. See the solution:

How do I make my minecart stay on the rails?

(Can’t post pics right now because I’m on mobile) I’m trying to make a minecart for my game, and while I can move it just fine, I can’t get it to stay on the rails (Which right now is just a block beneath it w/ velocity set). I’ve tried to add invisible bricks beneath it that go under the “rails” like those old roller coasters used to do to stay on the track, but that doesn’t really work and if I try to make the cart take a turn it totally breaks. Sorry if I’m being too vague, but I’d like so…