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How do you get to 16.92 feet? 1 mile is 5280 feet, is about 135 pieces of 39' length. Thus the total play on one mile is about 17 inches. Here is an interesting presentation about the differences in thermal behavior of jointed and welded rail following European standards: <a href="https://pwayblog.com/2017/03/01/rail-thermal-forces-for-jointed-and-cwr-track/">https://pwayblog.com/2017/03/01/rail-thermal-forces-for-jointed-and-cwr-track/</a> I'm not sure how it translates to American practices. The physical pasics are the same but the fastener systems differ and thus the longitudinal resistance might differ. Regards, Volker Edit: Rails are usually fastened with elastic clips to the ties in Europe. These clips provide a vertical pressure between rail and tie and by resulting friction a resistance against longitudinal movement of the rail by changes of temperature or outer forces. In spiked track the rail anchors are intended to do the same. How effective they are I can't answer Here is some information about thr requirements: <a href="http://www.rta.org/assets/docs/TieReports/tiereport6.pdf">www.rta.org/assets/docs/TieReports/tiereport6.pdf</a> <a href="https://www.arema.org/files/library/2008_Conference_Proceedings/Resistance_to_Rail_Creep-What_Do_Rail_Fastenings_Really_Have_to_Do_2008.pdf">https://www.arema.org/files/library/2008_Conference_Proceedings/Resistance_to_Rail_Creep-What_Do_Rail_Fastenings_Really_Have_to_Do_2008.pdf</a>
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