B-50-40 Box Cars
A roster of the B-50-40 class box cars is provided as follows:
SP 219206-219505 7-9/1957 P-3109 SP 683522-683821 12/1956-2/1957 auto loaders (permanent numbers SP 219506-219805)
These 50'-6" box cars were all built to the same basic design by SP Equipment Co. in 1956-57 as above and featured 4980/4567 ft3 capacity and an 15'-4" door opening. As with the B-50-38 class, it is assumed that the 300 loader-equipped cars of this class were constructed with their assigned-service numbers in the 683xxx series and later renumbered into their general-service 212xxx series numbers, but this is only conjecture at this time. More research is needed!