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July 21, 2017 6:00 PM, EDT
Kenworth Mixer, Dump Truck Demonstration

Kenworth Mixer, Dump Truck Demonstration

A T880S mixer fueled by compressed natural gas and a T880 dump truck take to the course at Dirtfish in Snoqualmie, Wash., during Kenworth Truck Co.'s ride and drive of vocational vehicles July 21, 2017. (Roger Gilroy/Transport Topics)