What is S Shuttle?
{{distinguish|S (New York City Subway service)}} {{Infobox rail line | box_width = | name = S Shuttle | logo = S Shuttle logo.svg | logo_width = 50px | color = {{rcr|MUNI|S}} | image = S Shuttle train at Embarcadero station, October 2017.JPG | image_width = 320px | caption = A 2-Car S Shuttle train at Embarcadero station in 2017. | type = [[Light rail]] | system = [[Muni Metro]] | locale = [[San Francisco]], [[California]] | start = [[Embarcadero station]] | end = [[West Portal station]] | stations = 9 | daily_ridership = | open = {{start date|2001|4|2}} | owner = [[San Francisco Municipal Transportation Agency]] | operator = [[San Francisco Municipal Railway]] | linelength = | gauge = {{RailGauge|ussg}}<br>([[standard gauge]]) | electrification = [[Overhead line]]s, 600 [[Volt|V]] [[Direct current|DC]] | map = {{S Shuttle}} | map_name = Route diagram }} The '''S Shuttle''' is a [[light rail]] line in the [[Muni Metro]] system in [[San Francisco, California]]. It runs through the entire [[Market Street subway]] and [[Twin Peaks Tunnel]]. ==History== [[File:S Shuttle crossing over near West Portal, June 2017.JPG|thumb|left|An S Shuttle train crossing over near West Portal station in 2017.]] Muni introduced the '''S Castro Shuttle'''. This aimed to reduce crowding at the busy [[Castro station]]. The service began on April 2, 2001. At this time it was running only at [[Rush hour|peak hours]] on weekdays.<ref>{{cite book |url=http://tjpa.org/uploads/2009/11/FEIS_Ch3.pdf