To create your own roller coaster tracks, see my roller coaster editor mode

Roller Coaster

A deathmatch game mode with a roller coaster going around the map. Players can ride the roller coaster by using interact and hop off by crouching. There are currently 10 supported maps, but more are to come. The default gamemode is mystery heroes deathmatch, but it should work on any non-team based mode.
It is possible to attach the carts together as a train by editing the second rule in the workshop editor. By default the carts are equally spaced along the track. (To do this, open the workshop, open the first rule titled 'init global variables/settings', open the action Global.ShouldSpawnAsTrain = False and change false to true)