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A gas turbine can be more efficient then a diesel when used as a powered for a generator. That is how I read this. The electic motors at the wheels are powered by a battery. The CNG turbine just trys to keep the battery charged. In 1200 miles both the batteries and the CNG is empty and it needs charged and refuled. The driver would be at his limit anyway before that point. Many heavy trucks are used less then 500 miles and may be able to go pure electic.
As pointed out, this is how a locomotive works but also how a submarine is powered.
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