Berlin U-Bahn
Mass transportation system
The Berlin U-Bahn is a rapid transit system in Berlin, the capital and largest city of Germany, and a major part of the city's public transport system. Wikipedia
Began operation: January 15, 1902
Annual ridership: 553.1 million (2017)
Average speed: 30.7 km/h (19.1 mph)
Daily ridership: 1,515,342 (average daily, 2017)
Electrification: 750 V DC Third rail
Headway: 4–5 minutes (daytime)
Number of lines: 9 (numbered U1–U9)