World's Simplest Electric Train

This is the world's simplest electric train which runs not only inside but also “outside” the coil.
【Structure and How to make】 ※日本語での説明は欄の下

It's possible to get such power using a dry battery, neodymium magnets (something plated with metal) and a bare copper wire.
A point is that a magnet's diameter is bigger than a dry cell battery's diameter.
And an electric current flows to a coil through a neodymium magnets, and a coil will be an electromagnet only in an area between the magnet and the magnet.
The electromagnet and a neodymium magnet poles repel each other at one side.
The other side poles pull against each other.
They work same direction, and it become a big force.
The phenomenon also continues at a movement destination.