Yardmaster96 posted:The only reason I even mentioned those curve diameters as being up there in size is because if you look at any lionel book showing the track and curve sizes, 096, I think that's right, is the highest they go. Am I being informed that somewhere out there an 0100 or 0120 exists? Just asking, not being combative. I only the know the model train world that the catalogs, internet and ebay show me. Thanks
Yes, I understand perfectly. A lot of O-gauge trains are designed to run on track curves as little as O27, O31, O36, and O42, since that's all a large percentage of O-gaugers have room for. Therefore, in the O-gauge world, O60, O72, O84, and the like, start appearing as pretty generous curves. 2 rail O-scale modelers with enough room to have approx.1.5% maximum grades and approx. O120 minimum curves can undoubtedly start seeing their need for traction tires diminish fairly quickly. But how many modelers in 3 rail, or even 2 rail, actually have that kind of space available? Probably not too many, in my estimation.
Everybody's situation is a little different. Therefore, Clint Eastwood's advice is sound advice. 
