Looking at the layout of the machine, it appears to have leading and trailing trucks, but no evidence of driving wheels. Could just be the photo. However, the steam pipes from the top of the boiler lead down to horizontal cylinders above the chassis frame. Another photo shows that they drive the cutting disc through heavy duty exposed bevel gears. There appears to be no link to the wheels.

Any better information would be appreciated, especially if you have seen the Alco (Cooke) record for this interesting, if rusty, survivor.