Help with procedural roads and splines

[ramiroflores]

For context, I am very new to unity. I am try to make a train and railway system, and I'm slightly unsure how to approach it. I have some experience with using a linear bezier curve to make an object follow a predefined path but that won't be appropriate for my task.
Does anyone know of any useful free or affordable tools that would be helpful for a train system that can handle a path with varying heights?
From what I can tell Curvy Splines 8 looks like it would be the perfect solution to my problem, but I'm hopeful there might be a more affordable tool out there.
Thanks for any input

[_Aka_]

Hi,
I don't believe you will find a cheaper tool with all the features of Curvy Splines, its customer support and its continuous updating. Right now Curvy Splines is 50%, this might be the right time for you to get a license.
Have a nice day