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[quote user="Overmod"]You will note in the document you cited that the CEM discussions and even illustrations go up to units with 20 bricks. I wonder what engine that unit might be installed on.[/quote] The Application & Installation Guide shows in Table IV.2-1 on page 15 that 16 and 20 bricks are used for the 3500D and C175 engines. [quote user="Overmod"]Carefully not discussed is, or appears to be, whether Cat continues to bundle a 'self-regenerating' filter (they have seemingly always tried to avoid calling this a "DPF" whenever they can in discussing ACERT) as the follow-up to the DOC in their pre-module on engines that use DOC. [/quote] I'm not sure if the current C175 engines are still Acert equipped. The 2012 railway engine ratings guide shows a C175-16 Acert. I haven't found a newer guide. The marine engine railway guides from 2012 to 2017 all show just C175-16. So I don't know what to believe. The Application & Installation Guide shows in Figure 2-1 on page 14 a CEM system diagram without DPF and without DOC. From a Cat FAQ page: <a href="https://www.cat.com/en_US/by-industry/marine/USEPATier4FinalMarineEmissions/tier-4-faq.html?cq_ck=1443800038821.html">https://www.cat.com/en_US/by-industry/marine/USEPATier4FinalMarineEmissions/tier-4-faq.html?cq_ck=1443800038821.html</a> Q. For these marine engines, are any other after-treatment devices needed besides the SCR system (ie. diesel particulate filters (DPF), diesel oxidation catalysts (DOC), exhaust scrubbers, etc.)? A. No. Additional after-treatment such as DPFs and DOCs are not required. The reduction of particulate matter (PM) down to Tier 4 Final levels has been achieved through in-cylinder enhancements which eliminate the need for these additional after-treatment devices. All above is found in papers on marine applications. But as the emission limit are almost the same as for locomotives the measures won't be different. Regards, Volker
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