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In the foreground rests the fuel tank, still sporting the bronze plaque affixed when the locomotive was donated to the City of Medford by the Medford Corporation. To the left and rear of the fuel tank sits the cab. Still resting on the locomotive frame the water tank rises above the cab. Little will be done with these components until the boiler and running gear are reworked. |
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At the bottom of this picture is the smoke box cover plate. Along with the smokebox door (not shown), it forms the front end of the boiler assembly. On top is the petticoat pipe which is suspended in the smokebox and directs steam exhausted from the cylinders up through the stack. It is designed in such a way to use the venturi effect to suck combustion products (smoke, heat, gasses and flame) through the boiler flues and tubes. This creates the chuff, chuff, chuff sounds so characteristic to a steam locomotive. At the top of this picture lies the fire pan. |
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The object in the foreground is the smoke stack. The large bulbous spark arrestor required for locomotives to run in the woods in the summer has been removed. Behind the stack is the air tank and beyond that is the steam dome cover. |
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The three engines (piston, cylinder, rod and valve assemblies) are securely bolted to this sturdy steel stand. This is the back side of the engines; rarely seen unless removed from the locomotive. |
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A more familiar view of the the engines.
For those of you not familiar with the principles of a geared locomotive, steam introduced into each of these cylinders (at the top) forces a piston and rod downward. The rod is connected to a crank shaft (at the bottom) which transfers the up and down motion into lateral rotational motion just like in an automobile engine. |
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Little is left on the frame except for the air pump (middle
of this
image) and air tank brackets to the right of the air pump. The
engines
mount to the frame and boiler just to the left of the air pump.
The crank from the engines connect to the universal joint
(resting on
blocks below the air pump) which drives a shaft to the truck under the
front (at right) end of the frame. Pinion gears then turn each
axle
to propel the locomotive. |
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The middle of the frame and middle truck. The cab once
sat in
the middle of this picture. That white thing is the Johnson Bar
(reversing
lever).
The engine crank also connects to another universal joint (under Johnson Bar) to provide power to the rear trucks. Both axles of all three trucks receive power from this drive train arrangement. With additional U joints at each truck this type of locomotive can negotiate uneven track pulling loaded cars up steep grades. |
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The fireman's side of the frame is pretty plain with none of the gears, shafts and universals of the other side. On the left are stacked the flues and tubes which came out of the boiler. |