Hamburg U-Bahn Extension Opens

On July 13, 1914, Hamburg opened a key extension of its U-Bahn system from Hauptbahnhof to Ohlsdorf, significantly expanding rapid transit coverage in the growing port city. The project featured advanced electric multiple-unit trains and deep-level tunneling techniques that improved capacity and reduced surface congestion. This development supported Hamburg's industrial and commercial expansion just before World War I and established standards for German urban rail systems that influenced later networks in Berlin and Munich.