designation for a short while until its interchange with the Lyndon B. Johnson Freeway (I-635), where State Highway 121 continues north as the Sam Rayburn Tollway. Bus routes serving the airport are operated by Dallas Area Rapid Transit (DART) and Trinity Metro. DART operates route 230 from Downtown Irving/Heritage Crossing Station and Southwestern Medical District/Parkland Station to the Remote South Parking facility, and Trinity Metro operates the TRE Link bus route from CentrePort/DFW Airport station. Three rail systems serve the airport: DART Light Rail, TEXRail, and the Trinity Railway Express. DART operates light rail from DFW Airport station located at Terminal A. This provides direct rail service on the to Dallas and Las Colinas (with a later extension to DFW Airport North station). TEXRail is a commuter rail service between Terminal B and T&P Station in downtown Fort Worth. DFW Airport is additionally served by the Trinity Railway Express commuter rail line at CentrePort/DFW Airport Station via shuttle bus to the Remote South parking lot. The line serves both downtown Dallas and downtown Fort Worth. There is also the DART Silver Line opening in 2024 which will serve terminal A. A consolidated rental car facility is located at the south end of the airport and connected to all terminals by a dedicated network of shuttle buses. Hosting ten rental car companies, the center was completed in March 2000. Other facilities A cargo facility at 1639 West 23rd Street is located on the airport property and in the City of Grapevine. Tenants include China Airlines, Lufthansa Cargo, and the U.S. Fish and Wildlife Service. The DFW Airport Department of Public Safety provides the airport with its own police, fire protection, and emergency medical services. The DFW International Airport headquarters is located nearby at 2400 Aviation Drive, DFW Airport, TX 75261. In 1995, the airport opened Founders' Plaza, an observation park dedicated to the founders of DFW Airport. The site offered a panoramic view of the south end of the airport and hosted several significant events, including an employee memorial the day after the September 11 attacks in 2001 and the airport's 30th anniversary celebration in 2004. As part of the perimeter taxiway project, Founders' Plaza was closed in 2007 and moved to a new location surrounding a -tall beacon on the north side of the airport in 2008. The plaza features a granite monument and sculpture, post-mounted binoculars, piped-in voices of