One of the processes for applying designs to metal is a process called dye sublimation. The metal has a very thin coating of polyester and the printer used is just like your home DeskJet printer. What's different is the ink used. The dye sub ink is printed in reverse on a sheet of paper and the paper is placed face down on the metal substrate. It is then put into a heat press just like the old heat transfer t-shirts were a while back. The heat vaporizes the ink and fuses it into the polyester (sublimation) and makes it permanent and very durable.
I had never thought of doing it for tin-plate trains but all I can say is WELL DONE! In addition to the printing your skill as a tin smith is impressive, thanks for sharing. Russ
