Another good rail colour is Humbrol Matt 186, although having bought two tins showing wildly different shades, I don't know which one is the real 186! I used the darker of the two shades because it was similar to PPC 977 Track Colour.
Large prairie 6169 at rest on one of the loco spurs. She will have been coaled and watered on arrival, the crew would have cleaned the fire and turned her, ready for the return working after a short lay over. Time now for a trip to the mess room to fill the tea can.