Try the Cyberspace World Railroad Home Page at
http://www.mcs.net/~dsdawdy/cyberoad.html

Find the links section, and you will find several links to rail museums,
 several of which are located in rail museums.

Conneaut, OH has a rail museum in a former NYC Station.  So does Northeast, PA.
  There is one in Worthington, OH, Dennison, OH, Bellevue, OH, etc. mainly
 small museums, but each have their own little niche.

Rick Rowlands
Youngstown, OH