pennytrains
Take a close look at those markings. That's basically what you need to make your own decals, big black boxes.
A-HA! So, how'd you make the black boxes? Did you blacken the decal stock and print over it, or print on black construction paper?
I tried an experiment of painting black some of that clear decal stock and printing on it but the yellow letters disappeared into the paint. Or maybe I messed up by using a flat finish black? It's a puzzler.
In the meantime I've found another decal source, Tichy Train Group. They don't have everything but they've got a fair amount.