T Third Street

T Third Street
Northbound train passing Mission Rock station in April 2018
Overview
Owner	San Francisco Municipal Transportation Agency
Locale	San Francisco, California
Termini	Chinatown Sunnydale
Stations	22
Service
Type	Light rail
System	Muni Metro
Operator(s)	San Francisco Municipal Railway
Daily ridership	17,100 (January 2024)[1]
History
Opened	January 13, 2007 (2007-01-13) (limited service) April 7, 2007 (2007-04-07) (full service)[2]
Technical
Track gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Electrification	Overhead line, 600 V DC
Route map T Third Street highlighted in red Show interactive map Legend Chinatown Union Square/​Market Street Powell Yerba Buena/​Moscone I-80 Central Subway 4th and Brannan Caltrain 4th and King 4th Street Bridge over Mission Creek Mission Rock UCSF/Chase Center UCSF Medical Center Mission Bay Loop 20th Street 22nd Street 23rd Street   Muni Metro East Yard   Marin Street Levon Hagop Nishkian Bridge over Islais Creek UP Evans Hudson/Innes Kirkwood/La Salle Oakdale/Palou Revere/Shafter Williams Armstrong wye Carroll Gilman/Paul Le Conte US 101 Caltrain Arleta Sunnydale This diagram: view talk edit Show route diagram

The T Third Street is a Muni Metro light rail line in San Francisco, California. It runs along the east side of San Francisco from Sunnydale to Chinatown, traveling in the median of Third Street for most of its length before entering the Central Subway as it approaches downtown. The line serves 22 stations, all of which are accessible. Most of the surface portion of the line runs in dedicated median lanes, though two portions operate in mixed traffic.

Limited service began in January 2007, with full service starting in April of the same year. The line was rerouted north of 4th and King to travel through the Central Subway to Chinatown on January 7, 2023. It was the first line added to the Muni Metro system since the N Judah in 1928.