Hey, i need help with grind rails

i saw many 2d platformer games have grind rails but i can't find any tutorials, so can anyone help me how to do these grind rails

Nitrollegus You want someone to write a tutorial for you?

Nitrollegus Yeah, experimenting is a good thing to do first.

Also, how would you like the grind rails to work? What would you like to happen? Theses are the things that you need to consider first.