T Third Street
Following service changes on June 30, 2007, the K Ingleside and the T Third Street lines were combined inside the Market Street subway tunnel. Though keeping their line designations, resulting in an upside-down, horseshoe-shaped route from Balboa Park to Bayshore and Sunnydale. At West Portal Station, inbound K trains heading towards downtown change their signs to the T line; at Embarcadero Station, T trains heading into downtown change signs to the K line.