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One thing that I noticed about the drawing is that the front truck has a shorter wheel base than the big hauler has. Shortening that would also help with the standard gauge look, I think.
 

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Pete, if you're looking for a bit of inspiration for that engine project, how about an 1890s D&RG 10 wheeler? You'd have to move the third driver to behind the firebox, but other than that... :)
 

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Yes, this engine has a long straight boiler, but it does seem smaller in diameter than the one you built, in relation to the drivers. If you could find a plastic pipe that would work with the smokebox from the big hauler boiler, that might be closer to the right diameter for this engine.
Doesn't the T-12 have a wagon top boiler? That wouldn't work for this engine.
 

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As best I can measure, the large diameter part of the boiler on my Big Hauler 10 wheeler comes to 61 inches in 1/20.3 scale. If the boiler on # 4 was about 58 inches or so with the lagging, that's a pretty close match. It's pretty hard to argue about a 3 scale inch difference. :)
That would mean that the straight boiler that Pete made from a couple of donors is actually pretty darned close to correct diameter.
 

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As for the domes, comparing the drawing to the engine picture, it looks like you would be able to use the sand dome for the steam dome, and find a smaller dome for the sand dome. The sand dome looked about the right size for the steam dome in the drawing. Just an idea for you.
 
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