Check out the C&O's Historical Society web page
http://www.cohs.org/modeling/basementsub.htm
It is in the August/September 2007 section
Hmm! Karen's comments are quite true. If you are NKP or PM you have very little to do as the model is pretty accurate for those two roads. If you are a C&O modeller as I am then you have a bit of work to do. Bell, sandbox, pilot, piping, reverser, airtanks, cab interior, booster and firebox to name a few. I've already started altering three locos to better fit the mould of a C&O Kanawah.
Charles Emerson
Queensland
Australia