Re: SAL auto car, running board height, and slack adjuster?
All I have to go by are original paint specs. The AF-1 cars 11000-11699 eceived metallic brown for the entire car including doors, underframe & trucks. Stencils were white as these cars predated the use of the heart having a fire-plug red background.
Modeling a repainted car is another matter, and based on photos the roof and/or running boards could be either black or metallic brown. A photo of Seaboard 22081 with reweigh & repack stencils 5-51 clearly has a black roof, probably car cement. Photos I have of other repainted cars tend to show metallic brown roofs. Repaints after 1944 would have the fire-plug red background.
A 6-52 repaint of B-7 19001 turtle-back roof box car also shows a black roof, so it’s my conjecture that Seaboard turtle-back roof box & auto cars received black roofs for a relatively short period around the early 1950s.
Wheres, the Seaboard Color Guide book shows 11248 with Silver Meteor slogan, likely repainted Jacksonville 7-59 with metallic brown roof.
I defer to Seaboard modelers who might have railroad paint/stencil drawings that denote dated revisions when different paint colors were applied to the roofs of these cars and if the running boards received the same colors when repainted.