Serpukhovsko–Timiryazevskaya Line (Russian: Серпухо́вско-Тимиря́зевская ли́ния IPA: [sʲɪrpʊˈxofskə-tʲɪmʲɪˈrʲæzefskɐjə ˈlʲinʲijə] Line 9) sometimes colloquially referred to as Grey Line (Russian: серая линия) is a line of the Moscow Metro. Originally opened in 1983 it was extended throughout the 1980s and early 90s and again in the early 2000s.
