Map of Muni Metro subway/light rail/streetcar system in San Francisco, showing Central Subway tunnel (under construction as of 2016) and revised routing for T-Third.
Own work, derived from sources listed below:

Muni Metro Map. San Francisco Metropolitan Transportation Agency (12 July 2007). Retrieved on 20 March 2016.
Central Subway Alignment Map. Central Subway San Francisco (14 September 2012). Retrieved on 20 March 2016.
File:Muni Metro.png: RickyCourtney
File:Muni Metro unofficial map.pdf: Isaac Fischer
File:Sfo2.png: Nico Brussels
File:SFMuniMetro.png: Darkcore~commonswiki
File:Caltrain logo.svg: Caltrain
File:Bart-logo.svg: unknown author
Mliu92