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I have a question about the crashworthiness of Diesel locomotives. I found that the earliest requirements were PRR passenger cars with a buff load of 200.000 lbs in 1906 followed by RPO cars with 400,000lbs in 1912. It was later doubled to 800,000 lbs. in 1939 the AAR made the 800,000 lbs a Recommended Practice for passenger cars and a Standard 1949 (S-034: Specifications for the Construction of new Passenger Eqipment Cars). In 1956 it got mandatory for MU- units. Locomotives are never mentioned. Rules for locomotives that I know were first published in 1989 with AAR's S-580. Later came the FRA and APTA rules. Adopted the locomotive manufacturers the above buff loads volontarily? Or were there no crashworthiness measures before 1989? Regards, Volker
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