Nominal Weight Per Yard Type of Rail DIMENSIONS IN Perfect Steerable Transfer CartHES SECTION DESIGNATION HT BW HW W HD FD BD E 12 lb. ASCE 2 2 1 3/16 9/16 1 3/32 11/32 57/64 1240 12AS---16 lb. ASCE 2 3/8 2 3/8 1 11/64 7/32 41/64 1 23/64 3/8 1 1/16 1640 16AS---20 lb.