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초록

Steel sleeper have largely two types, n and Y type, depending on their shapes and are used mostly in Europe since 1980. The leepers are made of steel of high strength and toughness, and thus recycling is completely possible up tp 100%. Since the weight is almost one quarter and the loss of that concrete sleeper, the cost for delivery is saved. In addition, high economical efficiency is expected from the extended maintenance intervals. The n type is used in Eurpe, Australia, mideast Asia and north America wheres the Y type in Germany. Steel sleeper with high functionality is domestically developed through the comparsion of characteristics with the shapes.