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[quote user="Overmod"]Volker, you haven't been listening. We had inductive train control worked out long before InduSi, and in fact mandated ATS, or something better 'to be developed' as a result of the mandate, for passenger trains shortly after the First World War. [/quote] Sorry if I don't know every American train safety system that was invented. I didn't try to show that we were earlier but that there were systems available earlier than the 15 years Euclid mentioned. [quote user="Overmod"]But what Euclid is discussing is a system that requires no fixed inductors or magnets or balises or, in fact, any wayside markers or tercom optical tracking. [/quote] I did understand it. I just wanted to show that systems were available long ago. [quote user="Overmod"]By the 1930s we had moved on to continuous code-based train control via multiple frequencies in the rails, which is inherently safer than any inductor-based intermittent system could possibly be -- this conclusion was reinforced quite recently with the multiple-unit collision about this time last year. [/quote] Which collision do yo think of? If it is Bad Aibling Germany in February 2016 it was caused by the negligence of the local traffic controler using his cell phone fore games and misjudging the train locations when he overrode the PZB90 system. Had he left alone the system nothing would have happened. The traffic controler was sentenced to 3 years and 6 month in prison. None of these systems are 100% perfect. PZB90 was deemed safe enough up to 100 mph and was implemented system-wide. For higher speeds there is the LZB now being replaced by ETCS. Regards, Volker
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