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The Black Mesa & Lake Powell RR was built in 1972 using all concrete ties. For the first decade they had a lot of problems with cracking and outright breakage of the ties. As time went on the "art" of making concrete ties progressed and, now they will outlast wooden ties. The BNSF through Flagstaff Az. where I live is now running on all concrete tied mainline and the trains pass through about every 12 minutes 24/7/365. Roger Eyrich
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