Introduction One of the best attributes of LEGO trains is the fact that they move! The laws of physics tell us that in order to move, we need energy; in particular, electrical energy. However, before we get into the obvious use of electrical energy to move our trains, it should be mentioned that many of us likely started our LEGO train journey with “push-along” energy from our arms. I remember receiving my first LEGO train set at age three. It was not battery-powered, but self-powered! For most children, this is how we start our play experiences. We are not burdened with having to know how electrical circuits work, how things like motors and switches, etc. need to be connected, or the basics of operation. We simply put our trains on the track and pushed them along (also making sound effects of course!) Eventually, we recognize that having our trains move themselves...

