This is a short how-to video show an easy trick to clean diesel, electric and multiple unit model train wheels. This is a useful trick if you have a model that is not running smoothly, whether at all or at certain speeds. In this video, we have a brand new Heljan Class 35 Hymek. It ran OK but wasn't great out of the box. This trick allowed me to see if it was the wheels, a problem with the contacts, wiring issue to the motor, circuit board or motor issue. All you need is a simple pair of…