SP B-50-15 Steel Sheathed 40' BoxcarA Folsom Locomotive Works product, fulfilled directly by Folsom Locomotive Works an exceptional N scale 3D printed model of the Southern Pacific B 50 15 Steel Sheathed 40 Boxcar, available in three historically distinct decal variants: SP Express, SP Overnight Prewar, and SP Overnight Postwar. The B 50 15 has one of the more interesting prototype histories in the Southern Pacific's freight car fleet. These cars began their lives as single sheathed