MetroLink is a light rail system that serves the Greater St. Louis area in the United States.
[5] The remainder of this initial 17-mile (27 km) alignment was completed on June 25, 1994 when the extension to Lambert Airport Main opened.
In 2001-03, St. Clair County extended the Red Line 20.9 miles (33.6 km) to the Shiloh-Scott station near Scott Air Force Base.
[9] In 2006, the 8-mile (12.9 km) Cross County Extension added Blue Line service between the Forest Park–DeBaliviere and Shrewsbury–Lansdowne I-44 stations via Clayton, Missouri.
[10] A 5.2-mile (8.4 km) extension of the Red Line from Shiloh-Scott to MidAmerica St. Louis Airport in Mascoutah, Illinois broke ground in 2023 and is expected to be operational in early 2026.