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When I found out the GE locomotives fitted with NextFuel natural gas kit were only Tier 3 compliant I was surprised. I had seen a number of European lng truck engines that were Euro 6 compliant (similat to Tier 4 heavy-duty trucks) with just a three-way-catalyst. Why this discrepancy? It turned out that all these engines were spark ignited like passenger cars. I learned during my search that all self-ignition dual-fuel engines need EGR, DPF, SCR to be Tier 4 compliant. GE Tier 3 engines, for which the kit is intended, are not equipped with these exhaust aftertreatments. If I didn't understand right feel free to correct me. Regards, Volker
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