UBahnLinien

U-Bahnlinien are the individual lines of U-Bahn networks in many German-speaking cities. A U-Bahn (Untergrundbahn) is an urban rapid transit system designed for frequent, high-capacity service, operating primarily on exclusive right-of-way. Central sections are usually underground, while some lines extend onto surface tracks or elevated alignments in suburbs.

Line designation and maps: Lines are commonly identified with the letter U and a number, such as U1 or U2 in several cities. Maps use color coding to distinguish lines, and interchange stations enable transfers between lines. The current network often reflects historical growth, with long through routes and shorter branches.

Operations: U-Bahn services aim for short headways during peak periods, with trains every few minutes. Services generally run from morning to late evening, with reduced hours on weekends. Maintenance or disruptions may be covered by substitute buses or shorter trains.

Infrastructure and rolling stock: U-Bahn lines typically run on grade-separated tracks to avoid mixed traffic. Power supply varies by city, with DC third-rail or overhead electrification. Stations are designed for rapid boarding and accessible transfers at major hubs.

Governance and role: U-Bahnlinien operate under municipal or regional transit authorities and form a core part of urban mobility. They connect central districts with outlying neighborhoods, support commuting and tourism, and interact with bus, tram, and regional rail networks.