Turmbergbahn, Funicular railway in Durlach district, Karlsruhe, Germany.

The Turmbergbahn is a funicular railway in the Durlach district of Karlsruhe that climbs the Turmberg hill over 315 metres, rising 100 metres at a maximum gradient of 36.2 percent. It runs on a single track with a passing loop, and two cars carry up to 52 passengers each between the lower and upper stations. The line closed on 29 December 2024, and a rebuild with an extended route is planned.

The railway opened on 1 May 1888, engineered by Karl Müller and run by Turmbergbahn Durlach AG. Its cars moved by water ballast: a tank in the descending car was filled until its weight pulled the other car up. The 1,000 mm line had three rails and Riggenbach rack sections for braking. In 1966 it was rebuilt with an electric drive, new cars and an Abt passing loop.

The Turmbergbahn is a regular weekend destination for families and walkers from Karlsruhe and the surrounding area. At the top, people spread out along the hiking paths or simply sit and look out over the lowlands below.

The line is out of service: it closed on 29 December 2024 when its operating licence expired, and rebuilding with an extended route began in February 2026. Until it reopens, the Turmberg is reached on foot via the paths from Durlach. The planned extension will bring the lower station to the Bundesstraße 3, next to the tram stop "Durlach Turmberg".

The Turmbergbahn closed on 29 December 2024 when its operating licence expired, after 136 years of service; it had been Germany's oldest funicular since 1888. Its 315-metre track climbed 100 metres at up to 36.2 percent, and the two cars each held 52 passengers.