03/28/2008 02:43 am ET Updated May 25, 2011

Volvo Promises Hybrid Truck, Bus Engines By 2009...

Swedish truck and bus manufacturer AB Volvo said that it had developed a hybrid diesel-electric engine for trucks and buses which could go into production by 2009.

Hybrid technology, which allows vehicles to run alternately on diesel or electricity or both simultaneously, has become increasingly popular for passenger cars, but Volvo said it was the first to produce hybrid technology for heavy vehicles.

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