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 - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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