Rail grinding

Ideally I’m trying to make something like these:

https://www.reddit.com/r/unrealengine/comments/10of127/working_on_a_3d_game_with_buggy_rail_grinding/

https://www.reddit.com/r/unrealengine/comments/hb3td7/its_not_much_but_i_gave_rail_grinding_a_go_with/

But it is just kicking my butt haha