I've purchased vinyl decals and "etched" nameplates by specifying the font and size. Try contacting custom stamp sellers on eBay to see if they can produce the specific type face you need.
I have used them to restore Lionel Post War engines only because many of the originals were stamped. I wouldn't consider them for other lettering projects. Its very difficult to get consistent results with a stamp. It was not uncommon to take 50 attempts to get a satisfactory result.
Contact Toy Train Rubber Stamps David Laurenzi 440-353-6989. He has a large selection of rubber stamps for pre and post war Lionel. He usually is also at York
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