The unbuilt U10 line, of the Berlin U-Bahn, was part of a planned "200-km-plan" extension of the Berlin U-Bahn from 1953–55 (scrapped in 1977). It would...

The Berlin U-Bahn (German: [ˈuː baːn]; short for Untergrundbahn, "underground railway") is a rapid transit system in Berlin, the capital and largest city...

The Munich U-Bahn (German: U-Bahn München) is an electric rail rapid transit network in Munich, Germany. The system began operation in 1971, and is operated...