Well... I might be a customer for some traction tires! 
I have an SGL brass Pacific that needs tires. They're 3mm wide and the wheels are 41mm in diameter exclusive of the flanges. I don't find anything commercially available that meets that criteria. I just upgraded this to Legacy and find that pulling power is less than stellar. Since it has a nice fat Pittman motor, I doubt that's the issue, it just spins the wheels on a 2.4% grade with seven MTH heavyweight passenger cars. My smaller Legacy Camelback hauls them right up the hill without missing a beat. The tires on the Pacific are pretty hard and don't seem to have any "grip", doubtless because of age.
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