The D Line (formerly Red Line from 1993–2006 and Purple Line from 2006–2020) is a 6.4-mile (10.3 km) rapid transit (known locally as a subway) line operating in Los Angeles, running between Downtown Los Angeles and Koreatown district. It is one of seven lines on the Metro Rail system, operated by the Los Angeles County Metropolitan Transportation Authority. In 2020, Metro renamed all of its lines using letters and colors, with the Purple Line becoming the D Line (retaining the purple color in its service bullet) and the Red Line becoming the B Line.