The 58th United States Congress convened from March 4, 1903, to March 4, 1905. It consisted of the Senate and the House of Representatives, with the Republican Party holding a majority in both chambers. This Congress was notable for addressing issues such as tariff reform and railroad regulation. During its session, the Senate had 90 members, while the House had 386 representatives. Key legislation included the Elkins Act, which aimed to curb railroad rebates, and the Hepburn Act, which strengthened the Interstate Commerce Commission. The 58th Congress played a significant role in shaping early 20th-century American policy.