Locomotives made specifically for logging railroads were Climax, Heisler, and Shay. Climax locos have a crankshaft beneath the boiler that is geared to the wheels. Heisler locos have a V-twin engine with the crankshaft running longitudinally under the boiler, and geared to the wheels. Shay locomotives have a vertical engine on the right side of the boiler, and a driveshaft geared to the wheels, also on the right side. Merle found this brief video showing a good closeup of the Climax system. Many Thanks, Merle!
Here is a static display of another Climax. It is a good look at the mechanical layout.
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