Operating Era: 1925-1973.
Original version era: 1925-1942.
Modern version era: 1935-1973.
The HO Kits in the #12800 Series B-50-15 single sheathed box car with steel sheathing, Murphy radial roof and AB brakes for Southern Pacific and subsidiaries are now listed under SINGLE SHEATHED BOXCARS (#12801) and STEEL BOXCARS (#12851, 12862, 12863, 12881 and 12882. Please see those listings.