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I'm at the limit of my knowledge on the subject, but for example, the engine temperature influences the combustion, so the cooling system indirectly affects the CO production.

Here's an interesting article on the Honda Insight hybrid, where they went "all out" in trying to meet low emission and high economy targets. There are a LOT of tricks in use...not all applicable to railroad engines, obviously, but there is an interesting parallel between the two.

http://www.osti.gov/bridge/servlets/purl/771011-FszVdC/native/771011.pdf

by asdf on Sun Jul 12th, 2009 at 10:37:52 PM EST
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