Creating a multi-rail track, that the player can interchange.

Hi, I want to create a simple game around the premise of a 3 track straight line path, that the player can interchange between the paths at any time through the level. If you have ever played bug on a wire then you'll understand the feel I'm going for. I am a novice programmer, so if you could handle me with kid gloves then that would be much appreciated

Thanks for your time.