Bred by Clair Wolverton of Indianapolis, Indiana, pacer Carty Nagle was foaled in 1934, out of Immortal La Paloma. Although the two never met, Wolverton named the colt after show horseman Carter F. Nagle of Lexington, Kentucky. Carty Nagle failed to win a race as a two-year-old in 1936. He was gelded over the winter and sold to R. C. Dahlinger of Dearborn, Michigan.
Carty Nagle broke his maiden in his first start of 1937. That season he won all of his thirteen events without the loss of a single heat (38). Although now considered a worthy candidate for the rich 1938 Grand Circuit events, Dahlinger preferred to race young performers and stay in his home state. Carty Nagle was sold to Paul Welp of Lewisburg, Pennsylvania during Christmas week, 1937. He opened his four-year-old season at Washingtonville, Pennsylvania, winning all three heats and giving him 41 straight victories, establishing the longest winning streak in harness racing history.
The streak was broken on July 29th at Agwam, Massachusetts, where Carty Nagle finished 4th and 8th respectively in the two heats of a tune-up for the Massachusetts Stake. His victory in the $5,000 Pacing Stake at the New York State Fair in Syracuse netted him the largest sum earned by any aged pacer in 1938 and lowered his record to 2:02. As a nine-year-old in 1943, Carty Nagle was sold to Immortal Bowman Brown, owner of The Harness Horse magazine. In his first event under Brown's ownership, Carty Nagle was victorious in the $2,500 Maine Pacing Derby at Old Orchard Beach, winning three straight heats. In October at Lexington Carty Nagle time-trialed in 2:00 and became 77th 2:00 pacer. The time trial achieved owner Bowman Brown's ambition of owning a 2:00 performer. The following year ten-year-old Carty Nagle was one of only two pacers to race in 2:00, the other being Immortal Adios.
In retirement at Brown's Hickory Hill Farm, Carty Nagle and Brown enjoyed each other's company for nearly 25 years. They died exactly one year apart, with Brown passing away at age 71 on October 24, 1968. On the same date a year later Carty Nagle was humanely put to sleep at the advanced age of 35.