Hi all, been experimenting a bit with letters and numbers for my 5in gauge model of a Qld Railways DL class loco. Eventually settled on the following process:
– generate full size drawing in CAD and print out
– trace onto white self-adhesive vinyl covering for folders/books etc (generic name in Australia is 'Contact' , may be called other things elsewhere)
– cut around outline using sharp hobby knife
– paint whole area of sheet with appropriate colour enamel (may need 2 coats)
– separate individual letters, peel off backing and place in position.
I'm not sure how durable they will be, but the Contact covering I have used seems fairly robust as a book covering for school books etc so should be ok for a lightly-handled loco. To be on the safe side I sprayed the completed lettering with a coat of clear gloss.
TIme will tell how successful this approach will be, but it was certainly easier than trying to hand-paint and cheaper than many other alternatives such as computer-generated vinyl letters, waterslide transfers etc.
Also of note is the builders plate, engraved from brass plate by a friend using a small CNC mill.