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 - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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