Roller Coaster Tracks (360° Loops) and More Minecart Features

I solely play Minecraft in Creative mode to build scenic train rides, so I would love to see new updates in this area. For example, it would be wonderful to have roller coaster-style tracks that allow for 360-degree loops. Also, I wanted to mention that the recent experimental feature command allowing us to adjust minecart speed has been incredibly useful to me! Thank you for that, and please keep expanding minecart and rail features.