train simulator

Hi forum friends, I live in Brazil and is my first post here in the forum, please if you are in the wrong topic change ok, good is this work with unity to about 1 year, and my dream would be to build unity in a simulator train, and today a friend of mine showed me this video, I’ll leave the link below, I wonder how would this script ie the physical simulator that was used in the rails and wheels will someone here could help me? ? follows the link to the video from ja appreciate the help of all thank you. video link http://www.youtube.com/watch?v=EyZ6V_rC2-s

Help me please if someone here knows how to make this script.

That sounds like a very specific coding issue. Either get a strong programmer (most likely paid), or start learning how to code. Might also good if you want it realist to learn some physics too.
Good luck.