Animate your models in minutes with the Walthers Cornerstone Motorizing Kit. This fully assembled drive unit is a drop-in mount for Walthers Double Track Swing Bridge (933-3088), 90' Turntable Kit (933-3171) and the Walking Beam Oil Pumps in HO (933-3170) or N Scale (933-3248), all sold separately. The kit can easily be adapted to other models. It's complete with a rugged DC motor and has 360:1 gearing to insure smooth, slow speeds. Please note this unit is for use with DC power only.