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[quote user="Overmod"]Someone in another F125 thread said "The Vossloh Eurolight ... is offered with the same C-175 engine as EU stage IIIb compliant using SCR and DPF instead of the exhaust silencer." Does that imply that European PM standards are that much more stringent? [/quote] I remember the quote. I re-read the source (Wikipedia): The CAT engines meet European Stage IIIA emission standards, and can be modified to meet 2012 IIIB emission standards by replacing the exhaust silencer with a diesel particulate filter.<a title="Diesel particulate filter" href="https://en.wikipedia.org/wiki/Diesel_particulate_filter"> </a> Somehow I added the SCR. Sorry for that. I haven't found a Vossloh/Stadler sheet showing the Euro IIIb measures on new built locomotives. The Euro IIIb PM limit is 0.034 g/bhp-hr. I do understand that a wall-flow DPF will clogg and needs regeneration. The diesel particulate matter have to go through the walls with about 10 µm pores. The SCR has between 200 to 400 channels per square inch going through the block. That means channels between about 0.055" x 0.055'' and 0.04'' x 0.04". Will that really clogg? Regards, Volker
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