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ATSF extended the jacket construction on some locomotives especially 4-8-4s. Than the smokebox would be painted black. Graphite is not one specified color. As it was mixed in the shops. There were many shades from silvery to almost black. Southern Pacific had smokebox and smokebox front painted graphite until 1946. In 1946 Aluminum paint was heat resistant enough that SP used it on the smokebox from from then on. I have seen ATSF models with silver smokebox fronts but I'm not sure if ATSF used Aluminum paint. Regards, Volker
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