How to build a custom railroad from existing elements?

Question

Algorithms

I want to write a program that will build an arbitrary railway based on the available elements ( curve element , straight line , arrows and bridges for crossing roads). Perhaps the program should build a road using the maximum number of elements.
I have never written anything like this before. What should the road construction algorithm look like? Where to begin?

Answer 1

I would start with Lego Digital Designer

Answer 2

There is little input. Should the road be looped? Can there be dead ends? Those. what should be the output? And then you can connect all the elements in series - also expensive.