From Engine Spotters Guide.
True of most Ps-4 engines after 1940:
"the typical Ps-4 was painted with standard smokebox paint, normally a medium gray. All of the jewelery around the smokebox----valve ladders, headlight, markers, hinges, pilot, Elesco feedwater heater and piping,bell bracket, handrails, were painted engine black".
"the cylinder head covers were not chrome plated or painted-----they were 'tinned' with babbitt alloy,a soft alloy of tin, copper and antimony and the effect was striking if the engine wipers kept the covers clean". [a lot of babbitt alloy around the Shops, it was used to reduce friction on bearings].
"all alumium and gold leaf paint had been changed to imitation shades to better withstand the acid wash bath at the wash pit".
"never say never about a Southern Locomotive's paint, trim and decoration". Good advice!
The only Southern Railway Ps-4 I have ever seen was the #1401 in the Transportation Wing during a couple of visits in the early 1980s. I don't recall all the specific trim and decoration but I do remember that it was an impressive experience. [My cousin worked there and I tried to get photos but she was afraid of being fired if caught].
When I rode the Crescent Greensboro to New Orleans in July 1949 to connect with the Southern Pacific for San Diego and boot camp, I remember that cab style diesels took us to Atlanta--probably E6s or 7s, then Ls class steam to Montgomery and diesels again for weight restrictions on the rickety trestles into New Orleans.