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[quote user="YoHo1975"]Volker, I think you're missing the point. Adjusting the rules MAY have helped EMD in the short term, but in theory it would have lead to more new loco sales overall. Also, please recall, the issues that make Tier 4 impractical on the 710 are on the order of thenths of a percent. An SD70ACe that is 90% of Tier 4 has acceptable Fuel economy and cost. They built a few test ones. It's getting it all the way to Tier 4 that doesn't quite work.[/quote] I don't think so. EMD admitted that they would have been able to get the 710 Tier 4 compliant but deemed it impractical for the reasons mentioned in the above linked article. Lowering standards when compliant locomotives are already in production is not a good idea. OK EMD could fall back to the 710 but GE would have to stay with the GEVO-T4. That is what I called preferential treatment of a single competitor. Even to reach 90% Tier 4 the EMD 710 would have needed at least EGR and a perhaps paticulate matter filters I think. According to the article EMD had testet the 710 for 3 g NOx from the off-road rule. When EPA came out with the final rule of 1.3 g they had to use more EGR and DPF. So they used EGR for the 3.0 g. [quote user="YoHo1975"]Also, Is the GEVO the HDL? Is the 710 the 645 the 567 the Winton 201? Is the new T4 Gevo the T2 Gevo?[/quote][quote user="YoHo1975"]Also, Is the GEVO the HDL? Is the 710 the 645 the 567 the Winton 201? Is the new T4 Gevo the T2 Gevo?[/quote] According to GE the Gevo is not the HDL but they used as a basis. Same for the 1010J and the 265H, EMD denies that the 1010 is a retread. The EMD engines you listed are different engines with same basic design fom the 1930s. I think the Gevo-T4 is mostly like the Gevo-T2 with the changes I described in a former post. The only objective test results I know of are UP 9900 a Tier 2 locomotive with added EGR, DOC, DPF that reached 3.387 g/bhp-hr instead of 1.3 for Tier 4: <a href="https://www.arb.ca.gov/railyard/docs/final_report_emd_tier_4_pm_aftertreatment_upgrade_83112_final_v1.pdf">https://www.arb.ca.gov/railyard/docs/final_report_emd_tier_4_pm_aftertreatment_upgrade_83112_final_v1.pdf</a> Regards, Volker
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