I had believed BTO was for getting an engine in a road name that was not very popular giving you a better chance to get it. I do not know what a minimum number would be to have it canceled. My point a few years back Lionel did a South Buffalo Railway switcher in two road numbers. I got the two. It was a small railroad in Buffalo, New York so that it may not have been known around the country. So my thought was that it would get done no matter what the number that was ordered. But then again they may have been enough orders in the other road names to justify the South Buffalo..................Paul
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