MetroLink (St. Louis)
MetroLink (reporting mark BSDA) is a light rail system that serves the Greater St. Louis area. Operated by Metro Transit in a shared fare system with MetroBus, the two-line, 38-station system runs from St. Louis Lambert International Airport and Shrewsbury in Missouri to Scott Air Force Base in Illinois. Intermediate destinations include downtown Clayton, Forest Park, and downtown St. Louis. It is the only U.S. light rail system that crosses state lines.
MetroLink shares some characteristics of a light metro or rapid transit service, including a largely independent right-of-way, a higher top speed, and level boarding at all platforms. Being a light rail network, but with sections and miles of subway tunnels creating a separate right-of-way, MetroLink can therefore be categorised as a semi-metro system.
In 2024, the system had an annual ridership of 7,135,000, or about 21,800 per weekday.