IN REGUARD TO SUBJECT ABOVE.DO THEY MAKE A B UNIT
HO or N Scale? And as a side note that item is discontinued, which is why I don't know what scale you are talking about. I have the HO F9A and they do not make a HO Chessie System F9B.
"B" units for Bachmann F-9?
Currently, there are none that I am aware of made by Bachmann.
The only F-9 "B" units i have found so far are made by Intermountain.
None are in Chessie System.
But that does not mean that they can not be repainted into CS colors.
http://www.imrcmodels.com/ho/loco/holoco.htm