29th was a rapid transit station on the Chicago "L"'s South Side main line. Originally constructed by the South Side Elevated Railroad company, it was one of the original ten stations opened on the Chicago "L", beginning service on June 6, 1892. The South Side Elevated Railroad merged operations with three other companies to form Chicago Elevated Railways (CER) in 1911, before merging outright with them in 1924 to form the Chicago Rapid Transit Company (CRT). Public ownership came to the "L" in 1947 with the Chicago Transit Authority (CTA).