B-50-31 Box Cars:
A roster of the B-50-31 class box cars is provided as follows:
SP 105600-107099
These 40'-6" box cars were built by SP Equipment Co. in 1-9/1952 and featured 3782 ft3 capacity, 7'-0" Youngstown doors, 3/4 improved Dreadnought ends diagonal panel roof, Apex running boards and 10'-0" inside height.
For more information on these cars, see the February and March 1993 issues of Railroad Model Craftsman magazine for an in depth article by Tony Thompson.