I know precisely what you want as I want some too!
When Dick Mayer was alive he fabricated (or had fabricated) several custom-lettered brass plates which he then mounted on a set of his RichArt Milwaukee Road heavyweight passenger cars for me. Each letter was stamped/etched into the brass plate then filled with black paint, polished, and finally clear coated. Very time consuming but fabulous work!
Not 100% sure that Dick did the work himself as he may have farmed it out to another craftsman. That said, his shop had the tools and he had the skills.
Miss Dick.
Bob Nelson