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[quote user="Shadow the Cats owner"]SCR stands for Selective Catalyst Reduction in Diesel technology. You spray DEF in the diesel exhaust stream over a catalyst to convert the exhaust into more enviromentially friendly compounds. [/quote] Agreed, but nevertheless I stay with the statement from Metrolink and Siemens that the F125 and SC44 don't have DPF. And there are reasons. - usually the DPF is before the SCR in the exhaust stream to keep PM out of the SCR catalyst. - EMD 1010-T4 and GE Gevo-T4 use solely EGR to comply with locomotive Tier 4 emmisions. The cooler combustion temperature reduces NOx but increases PM. But still both locomotive get away without DPF through cleaner combustion (common rail injection). - Cummins writes in a broschure: 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. EMD and GE were able to reduce PM by clean combustion why should Cummins not be able to do the same. - Last but not least: Truck PM Tier 4 limits are 0.01 g/bhp-hr, locomotive PM Tier 4 limits are 0.03 g/bhp-hr, three times the truck limit. Regards, Volker
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