The H2a hoppers were a Norfolk & Western design. Besides the 17” & 24” N&W lettering, the B&O, PRR, WAB, and IC schemes are also correct for leased/sold cars.
There are very few widespread car designs. Even PS1 boxcars have variations road to road and construction lot to lot.
Aggregate service is a good use for the C&NW cars.
Charlie Vlk