This has been discussed before and it seems impossbile to provide documentation that everyone will accept. In the early 70s, Dick Kindig checked all of his D&RGW and RGS color slides (he had photographed all the D&RGW and RGS ng engines existing in the late 30s). None of them had a green boiler. I asked three D&RGW retired engineers who worked the narrow gauge and they never saw one in green. The green paint and tri-color heralds seem to have been reserved for standard gauge passenger power. 499 and 489 were painted with green at Salida at the request of the Rocky Mountain RR Club for some excursion trips out of Salida. I have learned not to say never, but no one has been able to come up with a color photo of one in green other than the two out of Salida.