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[quote user="Norm48327"]One thing I have not seen in this or prior discussions on the subject of threaded spikes was a report on the metalurgy of them. [/quote] Norm, you didn't miss anything. What I found is e.g. that Pandrol uses spike screws according to ASTM 66, hot forged, normal 65,000 psi: <a href="http://www.pandrolusa.com/wp-content/northamerica/screwSpike-1.pdf">www.pandrolusa.com/wp-content/northamerica/screwSpike-1.pdf</a> Vossloh states: Some types of screw spike we produced are ASTM A66-87 screw spike, UIC864-1 screw spike (Ss series Ss8, Ss23, Ss25, Ss35, Ss36, DHS35 etc), 3V screw spike meet to NF F50-006, to name just a few. <a href="http://www.bsrailway.com/rail-fastening/vossloh-fastening-system.shtml">http://www.bsrailway.com/rail-fastening/vossloh-fastening-system.shtml</a> The UP Mosier, OR derailment was never investigated by the NTSB. The is a short preliminary FRA Report: <a href="https://gorgefriends.org/assets/images/issues/2016_06_03_Preliminary_Factual_Findings_Report_Mosier_Union_Pacific_FINAL.pdf">https://gorgefriends.org/assets/images/issues/2016_06_03_Preliminary_Factual_Findings_Report_Mosier_Union_Pacific_FINAL.pdf</a> It states on the last page: Volpe, one of the Department of Transportation’s research centers, is testing the metallurgy of the broken bolts. I haven't found neither the final report nor Volpe's results. UP must have made its own investigation but I haven't found it. [quote user="Norm48327"]One other factor May be the difference in loading of rail cars in Europe vs those in North America. I don't know load limits in Europe but ours are 286,000 pounds per car with exceptions for Schnabel cars and six axle cars.[/quote] The German load limits are 50,000 lbs per axle. On the other hand we have speeds of up to 200 mph. The Vossloh KS-24 is limited to 150 mph. In Sveden and Norway the ore railroad from Kiruna to Narvik has 66,000 lbs per axle. Here is a presentation about gauge widening with indications in the field: <a href="https://www.wheel-rail-seminars.com/archives/2015/hh-papers/HH-02%20WRI%202015%20Wolf%20Wide%20Gage%20HeavyHaul%20-%20with%20watermark.pdf">https://www.wheel-rail-seminars.com/archives/2015/hh-papers/HH-02%20WRI%202015%20Wolf%20Wide%20Gage%20HeavyHaul%20-%20with%20watermark.pdf</a> Regards, Volker
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