3D Platformer Rail Grind

[Asarge]

Hi, I can't seem to find an example scene or post that goes through this specifically but I would like to use Curvy Splines for a free-roam 3D platformer rail grind. In games like Fortnite or Sunset Overdrive the player can roam freely around and jump on/off rails placed around the world. Would you be able to add an example scene or perhaps give a short breakdown of the steps to get a similar result?