U-Bahn

The U-Bahn is a rapid transit subway system used for urban public transportation in many cities, such as Berlin and Vienna. It consists of underground trains that run on dedicated tracks, providing efficient and quick travel across city areas, often supplementing bus and tram networks. U-Bahns typically have frequent service, especially during peak hours, and are designed to reduce road congestion and pollution. They are an essential part of urban mobility, offering a reliable, fast, and eco-friendly way for residents and visitors to navigate densely populated city centers and surrounding neighborhoods.