The San Francisco Municipal Transportation Agency (SFMTA) is constructing a 1.7-mile light rail transit extension of the existing Third Street Light Rail Phase 1 line. The project will begin at the existing station at Fourth and King Streets and terminate in Chinatown at Stockton and Jackson Streets. It includes construction of one surface station, three underground stations, and the purchase of four new light rail vehicles to augment the existing fleet. When completed, the combined Third Street Light Rail/Central Subway will provide a continuous seven-mile light rail route connecting the heavily transit-dependent communities of Bayshore in the south with Chinatown in the north. Hours of operation in the opening year will be from 5:00 a.m. to 1:00 a.m. on weekdays and from 6:00 a.m. to 1:00 a.m. on weekends. Service will operate every 3.75 minutes during weekday peak periods, every five minutes during weekday off-peak periods, and every 12 minutes on weekday evenings. By the forecast year of 2030, service frequency during weekday peak periods will increase to every 2.5 minutes. The project is expected to serve 35,000 average weekday trips in 2030.