> A three point check gage when used correctly widen the track gauge  
> when used on a turn.
> Don

And, a three point check gage, when used INcorrectly, narrows the track 
gauge when used on a curve.  This might be a problem with long 
wheelbased steamers and cause binding -- depending on the curve and the 
steamer, of course.  I presume the roller type gage has the advantage 
that it can easily be made on a lathe (or screw machine) with no 
pattern, no mold, no casting and no subsequent machining 
needed.  "S"miles....Ed L.


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