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[quote user="Convicted One"]I don't believe I've ever seen anything similar, yet on the surface bthis seems like a great idea. Why did this not catch on?[/quote] They are used. They are going bythe name lag screw. There was a thread about a UP oil train derailment in Oregon. It seemed to be caused by broken lag screws: <a>http://cs.trains.com/trn/f/111/t/256871.aspx?page=1</a> Ordinary spikes can come loose but is easily detectable. Lag screws seem to break instead of coming loose which didn't get detected in Oregon. In 1949 the German Railway had more than 20 years exprience with this kind of rail fastener. It was first used in Oberbau K in 1926: <a href="http://www.geralds-bahnseiten.de/k-obau.gif">http://www.geralds-bahnseiten.de/k-obau.gif</a> Regards, Volker
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