In order to have devices like catalytic converters or diesel particulate filters, you have to have a very clean very complete combustion or the devices will plug up in VERY short order. on an automobile, an engine burning a little too much oil or a miss-firing cylinder can ruin a cat very quickly. If you've ever driven your car with a flashing check engine light, you can ruin a converter in no time, which is why the owner's manual tells you not to do it for anything more than getting the vehicle off the road. I can't imagine how you could EVER consistently get that complete of combustion in a locomotive fire box. I'm not quite sure how the EPA will look upon any NEWLY BUILT steam locomotives. Original ones are grandfathered in, but a new one, especially if used for a revenue generating purpose?
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