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I understand that the diesel was initially developed with the intention of burning coal dust (the <em>coal dust engine</em>), and that it later shifted to focus on burning oil as fuel.  I believe there has been some subsequent R&D effort on revisiting coal as fuel to be directly injected into compression ignition engines just like diesel fuel is injected.  Intuitively, it seems like it would be an uphill battle to get that worked out to a foolproof practice, but usually where there is a will there is a way.  I understand it was tried with a coal/water slurry.  Is that was is meant by liquified coal or is that something else?  Does anybody know what it going on with this approach?   
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