Guns,
You were more than lucky with the Legacy Shay, as MartyF advises the OGR members, the best way to safe guard yourself, if you are purchasing used, is to purchase from another OGR Forum member. Flebay is a crap shoot, I do purchase rolling stock in that manner however, especially if I know the company selling.
Guns you also have the engineering ability to repair stuff you purchase from fleabay, not many others do, your individual situation makes your crap shoot not quite so dangerous.
PCRR/Dave