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That coal slurry diesel sounds like it was ready to go.  I wonder where it stands today.  Here is a description of a dry coal diesel approach:<a href="http://www.patentstorm.us/patents/5456066/description.html">http://www.patentstorm.us/patents/5456066/description.html</a>It is a hard read but I glean the following:  The coal is micro pulverised onboard the engine by the use of a fluid mill using super heated steam as the fluid.  Electro static precipitators remove the ash from the powdered coal.  It is then injected by the use of compressed air, which also serves as combustion air, taking the place of a turbocharger.  Considerable heat generated during the milling process is transfered to the coal fuel and then reclaimed during combustion.I don't know about steam making a comeback, but this direct combustion of coal in a diesel engine seems like it might be right around the corner.
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