Somewhere in my photo archives I have picture of a very short (maybe 30') single-dome tank car with a SMALL diameter black tank lettered for Dow Chemical. It was in the boat yard at Ludington ready for loading on one of the C&O ferries. That was maybe circa 1981. Dow Chemical (Midland) was a pretty good source for loads for the C&O/Chessie System. Always thought it would make a great model for the model trains since it was short.
Neil