And in the latest sign of how the momentum for natural gas in transportation is accelerating, United Parcel Service plans to announce in the next few days that it will expand its fleet of heavy 18-wheel vehicles running on liquefied natural gas, or L.N.G., to 800 by the end of 2014, from 112. The vehicles will use the new Cummins engines, produced under a joint venture with Westport Innovations.
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