This is a 5" and adjustable to 71/4" gauge ride on loco. The petrol engine drives an Hydrostastic unit which in turn drives through two prop shafts to front and rear bogies with all eight wheels driving. The engine has an electric starter. The speed control gives zero to full speed in forward and reverse. The wheel gauge is adjustable between 5" and 71/4". The loco can be used on ground level or raised track. For raised track use there are two extended foot rests so you can sit astride. This loco is very powerful