At Riverside Speedway, a quarter-mile track in this far northern corner of New Hampshire, anyone over 10 can start racing in the derbies that take place here throughout the summer. At 11, Jenna Randall was gunning stock cars around the track at 50 miles per hour. At 12, racing in the under-14 division, she first climbed the winners’ podium. Now 14, she races against adults and has qualified for the season finale, the no-holds-barred Enduro.
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