Interesting locomotive. I'm a gear head at heart but never considered myself a train buff.
That said, I don't think I've ever seen a vertical piston driven horizontal crank bevel gear drive train on any other locomotive. And if the front driven wheels (trucks?) weren't cool enough it looks like the drive shaft extends back to the coal car (tender?) to drive additional wheels, which I dont think I've ever seen on another train either. Very unique design, with all the boiler and tender weight over the drive wheels I assume it would get better traction and have less slip. If so, was this a special purpose built engine for mountainous logging tracks?