'Scarab' is the first engine from Smith & Harrison and is based loosely on an Orenstein & Koppel industrial locomotive. The model is powered by a custom made high-torque, low-revving D.C. motor. This is regulated by a manual speed controller, specifically designed and built by us for use on our locos. Power is supplied by NiMh rechargeable batteries. (A charger is supplied with the loco.)