Facts and Figures
| Opened: | 1898; electrified 1925, modernised 1976 onw. |
| Length of route (2015): | 52.31miles / 83.7km total |
| Gauge: | 1.435m |
| Voltage: | 750V DC |
| Number of stations (2017): | 109 |
| Number of coaches (2015): | 770 |
| Passengers p/a (2015): | 440 million |
| Train intervals: |
Regular traffic: all lines: 5mins
Peak hours: U1: 2-4mins; U2: 5mins; U3,U4: 3-4mins; U6: 2-3mins Evenings: all lines: 7-8mins |
| Maximum speed: | 50 mph / 80 kph |
| Average travel speed: | 20.3 mph / 32.5 kph |
| Longest journey without change: |
Floridsdorf to Siebenhirten (U6),
10.75miles / 17.4km, travel time 36mins. |
| Longest continuous tunnel: |
Hintermayergasse to Spetterbrücke (U3),
5.87miles / 9.39km |
| Average distance between adjacent stations by rail: | 0.481miles / 0.771km |
| Longest distance between adjacent stations by rail: |
Heiligenstadt to Spittelau (U4),
0.99miles / 1.59km |
| Shortest distance between adjacent stations by rail: |
Museumsquartier to Volkstheater (U2),
0.21miles / 0.34km |
| Highest point: | Ottakring (U3), 227 metres above sea level. |
| Deepest point: | Schwedenplatz (U1), 142 metres above sea level |
| Greatest elevation from ground level: | Spittelau (U6), +13.6 metres |
| Maximum depth below ground level: | Altes Landgut (U1), -30 metres |
| Deepest lift: | Westbahnhof (U3), to Gerstnerstrasse, 22.25 metres |
| Longest escalator: | Zippererstrasse (U3), vertical rise 17.7 metres, length 53 metres |
| Station with the most escalators: | Karlsplatz (U1, U2, U4), 26 |