The following are links to videos showing the rail gun in action.

Video 1: See the capacitor being discharged by a wire placed between the rails.  A wire, which is difficult to see in the video, is wrapped around the end of the plastic rod. 

Video 2: See a close up of the rail gun firing a projectile.

Video 3: Watch a wide angle view of the rail gun firing.  The word "here>>" appears in the video to show where the projectile is after it slows down.  Since the digital camera being used takes only 10 frames per second (whereas a regular video camera takes at least 24) the projectile can only really be seen after it bounces back from the wall and has slowed down.