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SuzyQ; Some of my spline roadbed has been in place for about ten years with NO expansion or contraction problems. This older section is made from CEDAR rather than TREX. On the newest section TREX was used for the splines and the "feet" under the risers, with the risers them selfs made from treated 2x4 and 2x6 lumber. NO problems on this section either. Spline roadbed has a resilient quality that allows it to move with changes in temperature so affixing you track should not cause any concern. My track is all hand spiked rail on redwood ties with each and every tie nailed to the roadbed with NO gauge problems or gaping of the rail sections. SPLINE ROADBED IS A VERY STURDY, RELIABLE AND FLEXABLE ROADBED SYSTEM. I wrote this in upper case to emphasize how much I favor this system. As far as drainage goes, the spacers between the splines create gapes allowing water to run off quickly. Your plans to have an elevated track on a mountain side will be easy to buiild with spline roadbed since it can be placed at ANY height (within reason of course) even below grade or in tunnels. Keep me posted......OLD DAD
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