Ok, Just found this site, CHESAPEAKE AND OHIO DIESEL LOCOMOTIVE ROSTER - NE Rails
and If I am reading it right C&0 had 3 of them #20 - 22
Someone traded me a new Bachmann Louisville & Nashville DCC equipped switcher for some Building Blocks off my site!
Now that I think C&O had a few I just need to see a prototype picture so that I can re-do it with the right decals and details !! I found this picture from the L&N
searching for C&O 70 tonners I came up with a Pere Marquette decal set for number 20-22 could be they never got C&O paint but I'm a pennsy nut . Here is the decal link hope this is a little help Michigan Prototype Decals by Fritz Milhaupt