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Hyliion Inc.'s Class 8 long-range electric powertrain underscores the transition period of multiple alternative powertrains is at hand. And the powertrain, whose batteries are charged by an undersized natural gas engine, could prove to be an important step toward carbon-free over-the-road transportation, experts said. "We are in the messy middle," said Mike Roeth, executive director of the North American Council for Freight Efficiency.
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