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Pinions fitted on this shaft mesh into gears on each axle and 
thus transmit power to the driving wheels. 
Locomotives of this class are built in weights ranging from 
18 to 75 tons. Those of from 18 to 60 tons weight have eight 
drivers and those of from 65 to 75 tons weight have twelve 
drivers. 
A Climax locomotive with an upright engine and a "T" boiler 
is built in 15- and 18-ton weights. The frame of heavy timbers 
r 
Fig. 115. — A Heisler Geared Locomotive. 
is supported at each end by a pair of swivel trucks. Two ver- 
tical high-speed, double-acting engines are located in the cen- 
ter of the main frame and are directly connected to a shaft 
which carries two spur gears of different sizes, which mesh into 
two main gears on the center driving shaft. These provide a 
high or low speed as required. A center shaft transmits power 
to the driving wheels in the same manner as the horizontal style 
of locomotive previously described. This locomotive is used on 
stringer and light steel roads. 
The Heisler locomotive is built in weights ranging from 18 
to 75 tons. The locomotive and tender are carried on a heaxy 
steel frame mounted on two pairs of swivel trucks, one set being 
