Rail Boards are designed for use on all types of railway boxcars, including refrigerated and special cars for the lumber and the paper industries. First position the railboard next to the railcar. The locking ring will automatically secure the rail board against the dock. Box understructure bumpers fit around the car latches to protect door latch. All railboards are designed and built to match the specific dock conditions. The Bluff design is finalized by using information provided on a Bluff rail board worksheet. This information allows the manufacture of a railboard that has the proper width, length, bends, capacity, and understructure.