To expand on the subject of tracklaying with grey latex caulk:
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Mark your track location on your roadbed. Marking a line for the outer ends of the ties on a curve will make locating the track easier.
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Carefully pre-bend your flex track to the desired curvature, so it will fit your geometry without any fastenings at all.
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Put a small bevel in the top inside corner of each railhead, both ends of every track section.
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Spread the caulk thin and make sure you can see your track locating lines.
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Hold the track in place by driving fasteners between the ties, gripping the base of the rail on both sides.
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Load the track with canned goods, cordless tool batteries or similar weights until the caulk sets up.
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Once the caulk has set, remove the temporary fasteners. You are now ready to ballast the track.
I have been using these methods for laying track, including Atlas concrete-tie Code 83, for several years now, and am very pleased with the results.
Chuck (Modeling Central Japan in September, 1964 - with Atlas flex and handlaid specialwork)