Decals for Baltimore and Ohio covered hopper cars, in black, are available in S-scale.  Each set (# 104) does one car, and includes the “Linking 13 Great States” Capitol dome heralds.
These decals include the road name, road numbers for both sides and ends, and capacity data specific to these cars.  Each set provides 12 “canned” road numbers, and the modeler can easily make any road number valid for the cars.  Champion Decal Company provided valuable assistance in producing this decal set, which is based on their HC-42 artwork.