I suspect that the issues American railroads have with SGR aren't as big of factors in Europe since operating conditions are different. They are not running as many heavy trains into sparsely populated areas, and so resupplying the locomotive may not be as difficult. Also, the average trip is much shorter.
The EGR system on the Tier IV ES44AC added a couple feet to the height of the long hood. If this is typical, (I think the Class 70s have the engine similarly at the top of the hood) I think that any EGR duct would have to be run along the side of the prime mover. I'm not sure what modifications this would require, but any locomotives would presumably be cowl units like the Turkish ones.
NorthWest It appears that the last 7 EMD JT42CWRs (Class 66) are on their way to the UK. EMD is ceasing production, as they do not meet the European Stage IIIb emissions specifications. In total, 676 units were built. We'll see where EMD goes now. I don't think the GE Powerhaul series meets the standards either, but GE has announced that they will use EGR and DPF. I'm not sure how they will fit that into the UK loading gauge. In other news, Vossloh, a European locomotive builder that built diesels with EMD prime movers (first the 710 and now the C175) has announced that they are selling their transportation division, probably by 2017.
It appears that the last 7 EMD JT42CWRs (Class 66) are on their way to the UK. EMD is ceasing production, as they do not meet the European Stage IIIb emissions specifications. In total, 676 units were built. We'll see where EMD goes now.
I don't think the GE Powerhaul series meets the standards either, but GE has announced that they will use EGR and DPF. I'm not sure how they will fit that into the UK loading gauge.
In other news, Vossloh, a European locomotive builder that built diesels with EMD prime movers (first the 710 and now the C175) has announced that they are selling their transportation division, probably by 2017.
I know that the UK loading gauge is restrictive but I doubt an exhaust gas recirculation system would radically alter the envelope of the locomotive.
Roof mounted Exhaust Particle filters might be a height issue however..
I am fairly certainthat the new EMD 12 cylinder 265-H derived EGR Tier IV engine under development would not fit into a UK clearance sized locomotive but the Cat C175 series engine is in the new Class 68 locomotives, so maybe the bigger 20 cylinder version is an option. It will have to use SCR rather than EGR (at least for the forseable future) however, which some potential operators may not want.
"I Often Dream of Trains"-From the Album of the Same Name by Robyn Hitchcock
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