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[quote user="Shadow the Cats owner"]If you read on their website it states an intergrated SCR system we run ISX engines in our fleet and in that same intergrated system is a SCR and DPF in one module.[/quote] You talk about a truck engine and there you are right. But as stated before the Tier 4 PM limits for trucks are justone third of the locomotive limits. Here is a Cummins QSK95 broschure: <a href="http://www.marinepartsexpress.com/PDF/QSK95brochure.pdf">http://www.marinepartsexpress.com/PDF/QSK95brochure.pdf</a> On Locomotives (page 11): Cummins own exhaust aftertreatment system is purpose-designed for locomotive installations, using Selective Catalytic Reduction (SCR) technology. This unique, modular system minimizes space claim and improves fuel efficiency, lowering the overall cost of operation. Without exhaust aftertreatment, the QSK95 engine meets Tier 3 locomotive emissions and is ideally suited for locomotives operating anywhere in the world, however tough the conditions. And on page 20: The QSK95 is ready to meet Tier 4 and other very low emissions standards, using in-cylinder clean combustion to reduce Particulate Matter (PM) emissions and Selective Catalytic Reduction (SCR) aftertreatment to reduce Oxides of Nitrogen (NOx) emissions. And: For the most severe low emissions standards, the QSK95 aftertreatment system can incorporate PM-reduction technology, using proven Cummins systems. EMD and GE were able to avoid DPF on their EGR-only Tier 4 locomotive engines. The EGR reduces the combustion temperature and with it the NOx at the cost of higher PM production compared to SCR locomotives. GE and EMD managed the PMs through in-cylinder measures, e.g. common rail injection. Cummins has with these in-cylinder measures and higher combustion temperatures less PM than EMD 1010-T4 or GE Gevo-T4. From my point of view there is no need for a DPF for the QSK95 or C-175-20 on locomotives. If the QSK95 would have to comply with truck Tier 4 PM emissions most likely it would need a DPF. Regards, Volker
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