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Thanks for posting. It is a bit confusing. Neither the mentioned SMART Nippon-Sharyo DMUs nor the Siemens Brightline sets are lightweight. Both are stainless steel and FRA Tier 1 crashworthiness compliant with buff loads of 800,000 lbs. Only the TexRail (Denton) Stadler DMUs are lightweight with a buff strength of about 337,000 lbs. They are aluminum cars according to European crashworthiness standards. They got a FRA waiver from Tier 1 and follow and comply to the EFT-1 or AVT alternative design. I'm not sure if these design requirements are finally published. At the time of the waiver it was a draft. The TexRail line carries little freight and the RR would have separated freight and passenger traffic if the waiver wasn't granted. The question is why the PRIIA passenger car specifications require FRA Tier 1 crashworthiness compliance? There would have been a chance to try for a waiver. Perhaps the speed was the reason: PRIIA passenger cars 125 mph, TexRail Stadler 80 mph. Though it seems more a psychological reason as the standards take care of maximum speeds. We'll have to wait and see. Regards, Volker
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