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Arlington Park is a horse racetrack in the Chicago suburb of Arlington Heights, Illinois. It officially opened in 1927 to 20,000 spectators. In terms of horse racetrack's Arlington has been considered a technology leader. It introduced the first all-electric totalisator in 1933 as well as Chicago's first photo finish camera in 1936. Other technology advancements included installing the first electric starting gate in 1940 and the largest closed circuit TV system in all of sports in 1967.
In 1971 Arlington introduced the concept of Trifecta wagering.
Arlington Park was also the site of the first horse race with a million-dollar purse in 1981.
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