Haven't been where I could see chip cars moving to or from the plant, so not just sure what the local cars are marked like.
Since you have patched out your cars, you might want to consider making some of your own decals.
I don't know how to do them, but you could try "search community" in the right hand column to find posts on making decals. You could also start a new post asking about making decals.
Good luck,
Richard
Does anybody know if "woodchip service only" or something similar is available in a HO scale decal? I've got a bunch of hoppers that I have (mostly patched out) and I thought they might look neat with a woodchip decal on them.
Thanks
jim