Trivia: Which country’s subway system is called the U-Bahn?
Correct Answer: Germany
So why is this answer correct? : The “Untergrundbahn,” which translates from German as “Underground Railway,” opened in Berlin in 1902. There are other German subway systems by the same name in Munich, Hamburg, and Nuremberg, as well as a U-Bahn in German-speaking Vienna, Austria. Berlin’s U-Bahn is the most extensive network in Germany, with 10 lines and 173 stations.