The January, 1956 "Official Register of Passenger
Train Equipment" shows the St. Louis Southwestern
owning two express boxcars, SSW 3195-3196. These
are listed as 50'6" cars, AAR Mech. Designation "BX".
Anyone know if these cars were built new (and by whom)
as express cars or, as I suspect, rebuilt from existing
freight cars? These cars were listed right in with the
Cotton Belt freight car fleet in ORER's at least until
1943, but in the 1955-56 era they are listed only in
the Passenger Car Register.