Geared steam locomotives. 13:36 video, queued to 3:00:
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Those are Shay locomotives; the offset of the boiler to the left is a giveaway.
There are two other types of geared locomotives...
Geared locomotive types
Shay - offset boiler with a multiple-cylinder engine affixed to it on the opposite side, driving a longitudinal shaft geared to the axles via bevel gears
Heisler - 'V-Twin' style steam engine, one cylinder each side of the centralised boiler, affixed to a centrally located longitudinal driveshaft geared to the wheels
Climax - two inclined (typically 45 deg forward) cylinders driving a transverse crankshaft, geared to a longitudinal driveshaft placed centrally on the locomotive and driving the powered trucks via internal gearing
Last edited by mklotz; 12-07-2019 at 02:46 PM.
In terms of fuel usage per mile traveled they're probably less efficient than conventional. The friction from all that gearing almost guarantees that. But they weren't designed for long haul; they're meant for high traction and in that respect are more efficient than conventional. They're the right design for the job they were meant to do.
You can read more on the subject at the Wiki article...
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