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Western-Cullen-Hayes offers Type SG and cushion wheel stops, wheel stops for use in paved areas, hinged wheel stops and rigid and cushion shock-free wheel bumpers. Type SG wheel stops utilize the entire rail in stopping a car, not just a rail head. This wheel stop is rigid and suited for stub-end track where space is limited, the company says. The first few impacts set the gripping points into the bottom of the rail base. At the same time, the loop-clamp, positioned against a tie, tilts slightly forward and locks the block securely to the rail.