The Southern Pacific No. X6454 Box Car is listed in the Production Table as Variations F through I, and was available from 1949 until 1952. They were usually equipped with Type 3b or Type 4 Staple-end trucks. The differences in the variations are:
Variation F: WHITE lettering on an LIGHT BROWN body and painted metal doors to match the body color. Has large lettering in early thinned lined railroad herald circles with a break in the outer circle. Chassis has steps at the four corners. Issued in 1949.