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See a pair of big 500 plus horse power Challenger tractors prepare a Western Kentucky field for 2018 corn seeding. This Big Tractor Power video will discus the history of Challenger tractors from 1987 through 2018. Big Tractor Power takes viewers out into the field to see and hear a brand new 550 hp AGCO Challenger MT965E 4wd and a classic 500 hp AGCO Challenger MT865 tractor on tracks working side by side with big tillage implements.