CLICK ON A PART TO GET GOING ['Motor' that moves the Train] (?)

Hi! I thought the website scriptinghelpers.org went down, thank God it went back!

So my question is, how do i make a part go when it was clicked on it? Basically i am doing this for Train! (please ask me for my game! Also you can PM for free!!) soo..

If you have any tutorial or know something, answer!

If you could do that, you could help me for example:

Part: Button clicked -- Script: Moves when once pressed but can be stopped tho!!

Part: Engine ** ** -- Script: The main source that moves like: When Button is pressed it moves me as an Engine as a signal or activator!

That's it for now! :)

If you don't have the answer just please comment!!

Just as like you're starting motor! XD