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Thanks in advance.
Are you looking like how to build rails and how it is used with redstone, a mod or just in general how to make it function and loop around?
Here's some resoures:
http://minecraft.gamepedia.com/Rail
http://www.wikihow.com/Build-a-Railway-System-on-Minecraft
If you need anymore help or anything else please reply back or email me! My email is in my signature!