Arlington International Racecourse (formerly Arlington Park, the name was Arlington Park Jockey Club from as soon as 1948 up to 1955) was a horse race track in the Chicago suburb of Arlington Heights, Illinois. Horse racing in the Chicago region had been a popular sport since the early days of the city in the 1830s, and at one time Chicago had more horse racing tracks (six) than any other major metropolitan area. Arlington International was the site of the first thoroughbred race with a million-dollar purse in 1981. It was located near the Illinois Route 53 expressway. It was serviced by the Chicago and Northwestern Railroad. The premier event at Arlington Park was the International Festival of Racing, held in early August, which featured three Grade 1 races on turf: the Arlington Million