According
to Gene P. Shaeffer's "The Montour Railroad, M
8000-8099 are ex-C&O cars from C&O 40000-43749, obtained
in trade for 111 Montour gondolas in 1937.
For the sake of posterity and search strings, the reference should
be to CC&O (Carolina Clinchfield and Ohio), not C&O. The 111
gondolas don't seem to have made it onto the Clinchfield roster.