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Fuel always a concern for the railways..
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I'm not quite sure how, but I suspect "tradeoffs" in the exhaust gas makeup of EGR diesel engines may be at a point of diminishing returns and are more politically driven. <br /> <br />In the past, diesel combustion produced CO2 and high particulate, but other gases were lower, now, it seems, particulates are low but engines are producing CO and other gases are higher. <br /> <br />I'm not sure how but do know that the combustion process to produce CO2 is different from the process that produces CO, the external differences being heat and pressure.
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