Hello Larry: I've been going through some B&M conductor books that date to
1944 and also some that go back to 1925 and find that "C" cars are indeed a
mix of both hoppers and gons. I guess if you can put coal in them that's
the designation they got back then. A quick look at a 1955 UP conductors
book shows covered hoppers listed as "CH" and open hoppers as "H". Hope this
is helpful. Regards, Al Campbell