This is the world’s simplest electric toy train which runs not only inside but also “outside” the coil. You need Copper wire diameter 0.7 – 10 mm. / 25 m., Neodymium magnets diameter 1.3 mm, Battery LR1, E90, N, AAA.
This “Train” is made of magnet,copper wire and a dry cell. Enjoy watching this simple structure electric train.
Making of World’s Simplest Electric Train : (Tutorial)