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[quote user="Euclid"]One way I think it could happen is if you did actually have indestructible cabs in a head-on collision, and the locomotives totally disintegrated except for their cabs, and then the two cabs hit head-on. [/quote] In you described case you would have a crumple zone. In the 1995 the FRA researched a head-on collission of two trains, one with 5 locomotives and 92 cars, the other with 2 locomotives and 15 cars with combined velocity of 30 mph. None of the locomotives were compliant with the AAR S-580 requirement of the times. The used this scenario as a baseline calculating impact on locomotive and occupants. Than the calculated the same scenario but with S-580 compliant locomotives, and ones with more rigid posts than required by S-580. The baseline had the largest damage to the locomotive but the least impact on the occupants if the cab had stayed intact. But the cab got partly crushed. The more rigid the post in the hood got, the higher the impact on the occupants: <a href="https://rosap.ntl.bts.gov/view/dot/8456/dot_8456_DS1.pdf">https://rosap.ntl.bts.gov/view/dot/8456/dot_8456_DS1.pdf?</a> The researched some additional measures like interlocking but not deformable anticlimbers. In that case the peak deceleration was 15g in the other cases 11g. Just as a comparison the European standards allow a mean deceleration of 5g and a peak of 7.5g. Another interesting read: [url]onlinepubs.trb.org/onlinepubs/trnews/trnews286CrashTest.pdf[/url] Regards, Volker
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