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Adequate Rail Clamps provide the safety factor which protects material handling equipment from getting out of control before high speed winds. Here is pictured a pier leg sill of 12 ton Ore Bridge two Dravo Patented Automatic Rail Clamps. Capable of holding the bridge against a wind load of 45 pounds per square foot, these clamps are automatically applied at all times when showing 68 travel motors are not operating. The clamps also automatically set upon power failure and are further interlocked with an anemometer to operate at any time the wind reaches a predetermined velocity