A Challenger tractor being tested pulls the test car and multiple tractors being used to provide var
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161027_Tractor_031
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October 27, 2016
A Challenger tractor being tested pulls the test car and multiple tractors being used to provide varying amounts of drag as the tractor pulls it all around the oval test track. The University of Nebraska Tractor Test Laboratory (NTTL) is the officially designated tractor testing station for the United States. October 27, 2016. Photo by Craig Chandler / University Communication Photography.