Boydell described his invention as "endless rails" or an "endless railway wheel", later variations became known as Dreadnaught Wheels. In his system flat boards were attached to a wheel loosely at their centres. As the wheels revolved, they were capable of spreading the weight of an engine over the surface of the board. Boydell worked with the steam traction engine manufacturer Charles Burrell & Sons to produce road haulage engines from 1856 that used his continuous track design.