Green Line (VTA)  The Green Line is a light rail in Santa Clara County, California, and part of the Santa Clara Valley Transportation Authority (VTA) light rail system. It serves 26 stations in the cities of Santa Clara, San Jose, and Campbell, traveling between Old Ironsides and Winchester stations. The line connects Levi's Stadium, San Jose International Airport (via a bus connection), Downtown San Jose, San Jose State University, SAP Center, and Diridon station. It runs for 20 hours per day on weekdays, with headways of 15 minutes for most of the day. On weekends, train run at 20 minute headways for most of the day. After around 8pm on weekdays and weekends trains run at 30 minute headways. The Green Line starts from the Old Ironsides station (Santa Clara, California), which it shares with the VTA Orange Line. Traveling eastwards on Tasman Drive, the Green Line passes Levi's Stadium and the future Related Santa Clara mega-development. At First Street, it turns south and shares tracks with the Blue Line to downtown San Jose. After the Convention Center stop, it leaves the shared portion of the tracks and heads southwest to the Winchester station in southern Campbell, with a stop at Caltrain and Amtrak's Diridon Station. The whole route takes approximately one hour. From February 2000 to April 14, 2003, VTA operated all night train service with light rail vehicles (commonly known as "owl service") on a 70-minute frequency between Mountain View and Baypointe. At the time, VTA light rail was the only light rail service in the United States to operate 24 hours a day. The owl service was curtailed in 2003 as a result of mounting deficits. The route that the Mountain View–Winchester line now runs on is constructed in three different expansion projects: the original Guadalupe line, the Tasman West extension, and the Vasona extension. The trackway between Woz Way in Downtown San Jose and Old Ironsides station is part of the Guadalupe line, the first light rail line constructed in Santa Clara county. The Guadalupe line opened for revenue service on December 11, 1987 originally running from Old Ironsides station to Civic Center station in San Jose. Champion station was not part of the original line; it was added as intermediate stop as part of the Tasman West project. Service on this line was gradually expanded south from Civic Center station as follows:  The Tasman West extension project added the following features to the line as follows:  Tasman West extension was constructed with funds from 1996 Measure B sales tax measure.