Hanover Stadtbahn is a light urban rail transport system in the city of Hanover, the capital of Lower Saxony, Germany. It opened on 29 September 1975, gradually replacing the city's tramway network over the course of the subsequent 25 years. As of 2024, the Hanover Stadtbahn system has 12 main lines, one weekend express night line, and two supplemental lines, serving 201 stations, operating on 121 kilometres (75 mi) of route. The system is run by üstra, which was originally an abbreviation for Überlandwerke und Straßenbahnen Hannover AG. In 2007 Hanover Stadtbahn transported 125 million passengers per year.