Many of the PSC wood cars are loosely of SP heritage. Some may say they were crudely done as they are earlier renditions. The PSC SP Overnights car is a reasonably well done 1937 AAR all steel box car.
SP most certainly had Howe truss single sheathed single door cars but I'm not sure that SP had Howe truss single sheathed double door cars like your and I'm not at the house where my Tony Thompson SP box car books are so I don't have a definitive answer as to what your car in the picture represents, if anything. You might search SP A-40- since that would probably be the Espee car class. I do think somewhere in internet land there is a listing of Espee auto and boxcar classes.
Sadly these cars were offered by PSC with wood or dreadnaught ends only. Had they offered Murphy ends it would have loosely replicated a 1923 ARA single sheathed car as a very good stand-in for many other roads.
Oh, the Pacific Limited single door SP B-50-14 SP single sheathed wood cars are extremely well done. Available only in K brakes the are great cars nonetheless. The only thing lacking would have been newer AB brake versions or a radial roof car. The PL cars have nicely done brake rigging that replicates the Pacific Electric outside rigged hand brake chain routing.
