Railex System 200 Joist Frames: These Joists are 10” tall, which allows for a 13’ wide clear span on this installation System 200 Slick Rail Storage & Trolley Systems ← Railex System 200 Slick Rail Installation with End Frames and Brace Frames System 200 Brace Frames are used stabilize free standing or wide span areas of GOH slick rail and trolley systems. →