1933 🇬🇧 London Uxbridge, District → Piccadilly
1937 🇫🇷 Paris Porte d’Auteuil, 8 → 10
1937 🇫🇷 Paris Invalides, 10 → 14
1939 🇬🇧 London Stanmore, Metropolitan → Bakerloo
1967 🇺🇸 New York Culver Line, D → F
1967 🇫🇷 Paris Pré-Saint-Gervais, 7 → 7bis
1971 🇫🇷 Paris Porte des Lilas, 3 → 3bis
1976 🇫🇷 Paris Porte de Vanves, 14 → 13
1979 🇬🇧 London Stanmore, Bakerloo → Jubilee
1983 🇺🇸 New York New Lots Line, 2 → 3
1983 🇺🇸 New York Nostrand Avenue Line, 3 → 2
1983 🇺🇸 Washington Huntington, Blue → Yellow
1993 🇺🇸 Chicago East 63rd Branch, Red → Green
1993 🇺🇸 Chicago Dan Ryan Branch, Green → Red
1998 🇺🇸 New York Concourse Line, C → B
1998 🇺🇸 New York 168th Street, B → C
2001 🇺🇸 New York Brighton Line, D → Q
2001 🇺🇸 New York West End Line, B → D
2002 🇪🇸 Barcelona Pep Ventura, L4 → L2
2002 🇪🇸 Madrid Casa de Campo–Aluche, 10 → 5
2003 🇩🇪 Berlin Vinetastraße, U8 → U2
2004 🇺🇸 New York Brighton Line Express, Q → B
2006 🇺🇸 Chicago Cermak Branch, Blue → Pink
2009 🇧🇪 Brussels Erasmus, 1B → 5
2009 🇧🇪 Brussels Herrmann-Debroux, 1A → 5
2009 🇧🇪 Brussels Roi Baudouin, 1A → 6
2009 🇬🇧 London Hammersmith, H&S + Circle
2013 🇳🇴 Oslo Grorud Line, 5 + 4
2016 🇺🇸 New York Astoria Line, Q → W
2016 🇳🇴 Oslo Kolsås Line, 4 → 3
2016 🇳🇴 Oslo Songsvann Line, 3 → 5
2019 🇺🇸 Washington Greenbelt, Green + Yellow
2020 🇩🇪 Berlin Hauptbahnhof, U55 → U5
2021 🇺🇸 San Francisco Millbrae, Purple → Red
2025 🇺🇸 Washington New Carrollton, Orange + Silver
2025 🇺🇸 New York 53rd Street Tunnel, M → F
2025 🇺🇸 New York 63rd Street Tunnel, F → M
2025 🇫🇷 Bordeaux Aeroport, A → F
2025 🇫🇷 Bordeaux Blanquefort, C → E
2025 🇫🇷 Bordeaux Floriac, A → E
2025 🇫🇷 Bordeaux Gare de Bègles, C + F
2026 🇦🇹 Vienna Rathaus–Karlsplatz, U2 → U5 🚧

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1995 🇷🇺 Moscow Kashirskaya–Kakhovskaya, 2 → 11
2008 🇷🇺 Moscow Kuntsevskaya–Krylatskoye, 4 → 3
2009 🇩🇪 Hamburg Mümmelmannsberg, U3 → U2
2009 🇩🇪 Hamburg Wandsbek-Gartenstadt, U2 → U3
2015 🇪🇸 Valencia Llíria, 1 → 2
2015 🇪🇸 Valencia Torrent Avinguda, 5 → 7
2023 🇺🇸 Los Angeles Atlantic, L → E
2023 🇺🇸 Los Angeles Azusa, L → A
2023 🇷🇺 Moscow Elektrozavodskaya–Nizhegorodskaya, 15 → 11
2024 🇺🇸 Los Angeles Redondo Beach, C → K