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that for simulation of prototype operations?<br />
Some clarification might be appropriate here. The operation<br />
of the first shifter was straight forward: it was either in<br />
position for forward movement of the engine or reverse;<br />
that’s the only way it could work. But not so with the<br />
decoder driven shifter motors. The position of the valve gear<br />
on the 2-10-4 and 4-8-2 has nothing to do with the direction<br />
the loco may be traveling. Mechanically the loco could<br />
care less whether the model valve gear was set to forward or<br />
reverse. It will move in the direction the main drive decoder<br />
tells it to. Everything works fine, but it may look funny if the<br />
engine is moving west but the valve gear is set to go east.<br />
I have read about a cam mechanism that will shift the<br />
valve gear each time the loco starts in either direction.<br />
Sort of “click” and it’s moved. But I don’t understand the<br />
mechanics of this method. How does the cam keep from<br />
noisily clicking away as the engine moves down the track?<br />
I would be interested in hearing from others who have<br />
built methods to shift valve gear. In attempting to operate in<br />
a prototype manner, this is an interesting subject. Another<br />
interesting subject to think about is installing two speakers<br />
in a steam engine to better recreate that sound we like and<br />
remember. But that’s another story.<br />
u<br />
Beaver Creek Station<br />
laser cut wood, the industries finest plaster castings,<br />
reasonably easy assembly...<br />
overall footprint is 6 1/2” x 10”<br />
#6040 O scale $89.95<br />
www.bantamodelworks.com<br />
421 Hopkins Road<br />
Dummerston, VT<br />
05301<br />
800-653-8214<br />
July/Aug ’08 - O <strong>Scale</strong> <strong>Trains</strong> • 19
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