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[quote user="YoHo1975"]That the NOX requirements are unscientific and blocked EMD by an exceedingly small margin.[/quote] What does it matter if requirements are scientific or not? Both , GE and EMD, have shown that the Tier 4 NOx requirement are managable even without SCR. EMD wasn't blocked by a small margin. They were blocked by a wrong decision to stay with the 710. GE and EMD had the same chances. GE decided not to use the "old" FDL but design a new engine to reach Tier 2. If the numbers I read are correct, GE investet about $500- $600 million to get the Gevo from start to Tier 4. If it was a political wise decision to install these requirement is a complete different question. I understood that you don't believe cited EMD's statements in the linked Railway Gazette International article. EMD said they would have been able to get the 710 Tier 4 compliant but it was impractical with just EGR. That is the reason why EMD sells the 710 as E23 Tier 4 with SCR in the marine sector while GE sells the Gevo as 12V250 Tier 4 with EGR but without any exhaust aftertreatment. Regards, Volker
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