Cummins mechanical tech Patrick Black talks about the work he is doing to Alex Cook's Navistar 9900 semi truck at the Cummins Machine Integration Center in Columbus, Ind., Wednesday, March 6, 2019. The semi truck is powered by the first Signature 600 Diesel engine produced by Cummins in Columbus over 20 years ago. The truck was given to NASCAR driver and team owner Richard Petty by Cummins to promote the engine by hauling his race cars from track to track. The truck, which now has 1.6 million miles on it, was purchased by Cook and brought it back to Columbus where it is being refitted for Cummins' 100th anniversary celebration. Mike Wolanin | The Republic