Steel Thrie-Beam Rail is similar in nature to the W-Beam Rail except it is deeper (20” tall) than the W-Beam. It is considered a more robust section and used where higher traffic volumes are expected with a traffic mix trending toward heavier trucks. Like the W-Beam, it comes in standard rail lengths of 12’-6” and is similarly mounted and spliced except that it has two rows of mounting bolts instead of one. US Bridge will supply any standard or custom fabricated Thrie-Beam Rail that is needed for your bridge project.