Diesel trains are quite efficient, much more efficient than transport trucks.
Train steam engines are very inefficient, to have a steam engine as efficient as a power plant would require towing a powerplant behind the steam engine.
Coal can be very dirty, you can't tell just looking at the stack. A baghouse or precipitator catches particulates, they get sent back to burn again usually but sometimes not depending on the coal source.
A scrubber helps a lot to clean up the stack, but there is a lot of limestone hauled in and gypsum hauled out to keep a scrubber going.
Diesel trucks have some room for improvement but all that heat going up the stack is low grade heat. You could make some low grade wet steam and maybe get 10 hp out of it, but you'd be dragging another 2000 lb of equipment.
Now a stationary diesel, it makes a lot of sense to recapture that heat. And a lot of places do, use the heat for a steam cycle or district heating, or in some places, to run an ammonia A/C cycle.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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