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Rocla produces concrete crossties for heavy-haul, commuter and high-speed transit. The company's concrete crossties are engineered for optimum quality, durability and performance. The benefits of concrete ties are: long wear life; good gauge retention; low maintenance costs; great locomotive fuel economy; and low long-term costs, the company says. Rocla ties consist of high-strength, prestressed air-entrained concrete to give optimum structural performance and to resist abrasion, chemical reaction, moisture and freeze/thaw cycles.