Havelock ( CB&Q shops in Nebraska ) built a number of straight-sided mill gondolas, including Class GM-10 197550 - 197649 constructed in January 1968. These straight-sided cars had an unusually low inside height of 4 foot 6 inch to facilitate loading of steel products. The GM-10 class had nailable steel floors, 148,000 pound capacity and a capacity of 2,560 cu. ft."/>