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.