Here are the DS/SS/Steel splits, 1945, and 1950, for box and auto
cars in interchange service on the B&O and SP.
The B&O tables exclude 26 SS "box" cars, class LO, that are not
included in the ORER recapitulation. Two steel box cars (in 1945),
class XT, are excluded for the same reason.
The B&O reduced its DS fleet by more than 6,500 cars; even so, DS
cars far outnumbered SS cars in both years. The steel fleet
increased by over 3,400 cars; overall there was a decline of 3,177
box and auto cars.
The SP tables exclude 4 SS class XT boxcars not included in the ORER
recapitulation (3 in 1950).
The SP trimmed its meager DS fleet by 56% and its SS fleet by 40%;
steel grew by a whopping 7,710 cars. While there were almost as many
SS cars as steel in 1945, by 1950 nearly three fourths of the fleet
was steel. Overall, the fleet of box and auto cars grew by 2,773