Expansion phases

1. Expansion phase: 1969–1982

First Vienna underground expansion phase from 1969 to 1982
Von HerrMay – Eigenes Werk, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=56111289

2. Expansion phase: 1982–2000

Second Vienna underground expansion phase from 1982 to 2000
Von HerrMay – Eigenes Werk, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=56111396

3. Expansion phase: 2001–2010

Third Vienna underground expansion phase from 2001 to 2010
Von HerrMay – Eigenes Werk, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=56111432

4. Expansion phase: 2010–2023

Fourth Vienna underground expansion phase from 2010 to 2023
Von HerrMay – Eigenes Werk, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=56111453

5. Expansion phase: 2023–2028

Fifth Vienna underground expansion phase from 2023 to 2028
Von HerrMay – Eigenes Werk, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=56111483