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The Rankine cycle turbine can be more efficient than a diesel piston engine but emissions standards for NOx and manufacturing costs have been barriers in the past. The concept has merit even if CNG is not yet available at every truck stop. We have a local station for CNG in Sayre, PA and fleets in the region have their own fueling facilities. GE has put out bids for injectors to use CNG for their locomotive engines. Starting and braking are the high torque operations that benefit from electric motors. Hybrid pick up trucks may be in the offing too. Farmers and construction fleet operators are very cost conscious.
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