MOTIVE POWER AND ROLLING STOCK 
343 
ties, lighter bridges and a poorer track than for a rod locomotive 
of the same weight. 
On poor track where a speed of from 6 to 12 miles per hour, 
only, is possiljle, geared locomotives are preferable to rod because 
they have large fire boxes, short stroke engines, and a high piston 
speed. The slow cylinder speed of rod engines causes defective 
draft on grades. 
There are two types of geared locomotives, namely the center 
shaft and the side shaft. 
(1) Center shaft. There are several patterns on the market, 
the ones most commonly used being the Climax and the Heisler. 
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Fig. 114. — A Climax Geared Locomotive. 
The Climax is mounted either on two or three four-wheel 
swivel trucks. When two trucks are used, one is placed under 
the forward and one under the rear end of the locomotive. When 
three trucks are used, two are placed under the engine proper 
and one under the tender. The boiler is the horizontal locomo- 
tive type, mounted on a steel channel frame, reinforced with 
truss rods. Two single-cylinder engines are attached to the 
frame, one on each side of the boiler, and transmit the power 
directly to a heavy crank shaft, placed under the boiler and at 
right angles to it. This shaft is held in position by a frame fixed 
to the boiler, and power from the shaft is transmitted by gearing 
to a central articulated line shaft which passes to the forward 
and rear trucks and runs on bearings on top of each truck axle. 
