W-50-0 Work Cars:
PE 5500-5599 1910 National Dump Car (to SP 47566-47665) PE 5700-5899 1923 AC&F (to SP 52600-52698)
These work gondolas were built by AC&F as above in 1923. They featured **** ft3 capacity.
They were transferred from PE to SP and renumbered as above in 4/1940.
For more detailed information, consult Tony Thompson's book Southern Pacific Freight Cars Vol. I: Gondolas and Stock Cars.