The system has 42.2 miles (67.9 km) of tracks and is operated by the Santa Clara Valley Transportation Authority (VTA), which oversees public transit services in the county.[2][3] The initial segment of the VTA light rail between the Civic Center and Old Ironsides stations began service on December 11, 1987.[3] In 1988 and 1990, the system was extended south of Civic Center to Downtown San Jose and Tamien station.[3] Another 9.7 miles (15.6 km) segment to Santa Teresa and Almaden stations was added to the system in April 1991, completing the entire Guadalupe section.[3][4] In December 1999, the system underwent another extension with the completion of the Tasman West section and began services to Mountain View.