CS-9 Box Cars:
SA&AP 3000-3145 (to SA&AP 6755-6880)
These 34', 30-ton ventilated box cars were built by Pullman in 1897. They featured 5'-6" side doors, 2'-0"x0'-6" end doors and 1838 ft3 capacity.
For more detailed information, consult Tony Thompson's book Southern Pacific Freight Cars Vol. IV: Box Cars.