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HI I'm new to garden railroading and want to set my track in the existing concrete patio.I need to cut a groove 3.5 inches wide and 5/8 inches deep it is going to be about 80 feet long. my concerns are about expanding and contraction in temperatures from 110 degrees summer to 32 degrees winter. do I need gaps in the rails, expansion material where the rail meets the (new poured concrete) and clearances for the flanges of the wheels. If you have any advice for this project, i would be greetful .Thank you in advance , Scott
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