We cannot forget the purpose-built gear drive logging locomo
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With smaller diameter drivers (29” to 36”), driveshafts and gear drive,<span style="mso-spacerun: yes;"> </span>these work horses were not fast, but could haul heavy loads up steep inclines on uneven track and sharper curves then other locomotives!</span>
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First, the most widely used of the geared Locomotives, the Shay.<span style="mso-spacerun: yes;"> </span></span>
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With more than 2700 built from 1878 through 1945, the Shay had 3 vertically mounted cylinders connected to a crankshaft, turning drive shafts which drove ALL axles on the locomotive and tender, making it “all wheel drive” as it were.</span>
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