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S.P. NARROW GAUGE #18
As history goes, the #18 came along a couple of years after the #8 and #9. And
though sharing similar proportions, #18 was the only one of the three that was
built with "Walschaerts" Valve Motion. Which placed all of the moving parts
controlling the valve timing outside the frame, where it was easily
accessible, instead of inside and accessible only from a "drop pit".
If you've even been to the Owens Valley, or on the other side of the mountains between Schurz and Hawthorne, Nevada, you know that dust and sand are what that country "grows best". And since dust and sand are the enemy of bearing surfaces, the easier it would be to keep them lubricated, the less often major work would be needed. That makes sense to us, so we'll conclude this essay by giving our "nod" to that explanation.
Among other differences between #18 and her sisters look for
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