I think the use of steam to capture energy from waste engine heat is absolutely fascinating.
For the fun of it, Google "steam engines", "stanley steamer", or whatever just to see the torque figures of the old time steam engines.
Makes one wonder why every heavy duty truck and train engine mfr hasn't been researching the heck out of ways to incorporate steam into their systems for the incredible pulling power they could attain.
Maybe a tribrid engine Diesel-Electric-Steam or say a Westport Natural Gas(diesel)-Electric-Steam would be an unbeatable combination for power and efficiency.
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