Don't be so quick to count out Microscale. I have used them for custom decals. They were excellent folks to work with, and their prices were terrific. The downside is that you do have to do a minimum run of 250 sheets, so if it's something you need for just one or two cars, it's not practical. But if it's a decal you are going to need for a custom road on all your rolling stock and/or locomotives, it's a good option.