Algodoo

This isn't a Rail Gun. It operates sort of like a Coil Gun.

The only difference is that a Rail Gun has more than one stage and is USUALLY bigger.

Nope. A Rail Gun works on a totally different principle. A Coil Gun uses a coil of copper wire that produces a pulsed magnetic field which propels the projectile. A Rail Gun uses two very long copper rails that the projectile slides along and gets accelerated continuously until it leaves the rail. Do the research so you can learn the difference and see how different the two types actually are.

Here are a couple of links for you:

Railgun
Coilgun

Oh yeah, I forgot about that, all I remembered about hte railgun is that they electrify the rails that make a magnet or whatever...