The Modern Metro (U-Bahn), Phase 2 (1989-2000)
Immediately after the completion of phase 1, planning began on the second stage of the underground network:
Line U6: Heiligenstadt/Friedensbrücke - Outer Ring - Philadelphiabrücke
(modernised and extended line G, 10.6 km)
Line U3: Erdberg - Landstrasse - Stephansplatz - Westbahnhof - Johnstrasse
(newly built, 8.4 km)
Line U6 was opened in 1989, line U3 in three stages from the east to the west in 1991, 1993 and 1994 respectively. While these sections were still being built, work began on extending both lines at both ends:
- Line U6: extension south to Siebenhirten, partly using the track of express tram 64 (5.2 km)
- Line U6: extension north across the Danube to Floridsdorf (5.1 km) — the sections to Heiligenstadt and Friedensbrücke were closed.
- Line U3: extension west to Ottakring (2.1 km)
- Line U3: extension east to Simmering (3.0 km)
Line U6 was completed in 1996 and is now the longest line of the system at 17.4 kms; services on the western and eastern branch of line U3 opened in 1998 and 2000 respectively, making this line 13.4 km long. At the end of phase 2, the entire network reached a total length of 61 km (38.1 miles).
For exact opening and closing dates, see the animated diagram.