Posted by Dale Roth on February 18, 2022  Why is every fourth tie a different color? Is it wood? Posted by Casey Veranth on February 18, 2022  Hi Dale, they're probably corten steel. The curve is on a 1% grade. I guess there are some torsional and tensile forces the concrete ties aren't the best for. There might be a resonance or harmonic reason to do every fifth tie instead of the whole curve.

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