Hamburg U-Bahn Overview
Hamburg U-Bahn is a German rapid transit company that serves various cities in Germany.
It is owned jointly by the Hamburger Hochbahn AG and Norderstedt Mitte. Their network consists of four lines and 91 stations through which they serve more than 664,000 people on a daily basis.
As of 2017 records, the yearly ridership of this system was 242.5 million. It serves the cities of Ahrensburg, Hamburg, and Norderstedt. The operator of this system is Hamburger Hochbahn AG.
They have more than 240 trains and 850 cars in their network serving the people of this country.
The company was established on 15th February 1912 and since then they have gone through a long way. The area of this system is more than 100 KM covered by the system.

The company offers service at a frequency of 5 or 10 minutes in the cities they serve.
They operate all night on Friday & Saturdays, whereas their services are available from 4 AM to 1 AM from Sunday to Thursday.
Operating Company
As mentioned above, this system is operated by the Hamburger Hochbhan that was established in 1911.
The main corporate headquarters of this company is situated in Hamburg, Germany. More than 4,800 people are working with the organization controlling all their operations.
In addition to Hamburg U-Bahn, they owned many other subsidiaries like Eisen Bahnge Sells Chaft, BeNex GmbH, and Metronome. The City of Hamburg owns this operating company.
This organization operates a great underground system and a greater portion of the bus system. Their network consists of more than 100 bus routes and four underground lines.
References Taken
https://en.wikipedia.org/wiki/Hamburg_U-Bahn
https://www.hamburg.com/getting-around/11874814/public-transport/