Chiemsee-Bahn, Narrow-gauge steam railway in Prien am Chiemsee, Germany

The Chiemsee-Bahn is a meter-gauge railway in Prien am Chiemsee that runs for 1.79 km between Prien station and the Prien-Stock landing stage. Its green steam locomotive No. 7, built in 1887 by Krauss, pulls green passenger cars and has a black smokebox, chimney and buffers. The line has its own trackbed with Vignol rails and no intermediate stops.

The line opened on 9 July 1887, built on a contract signed on 15 March 1887 between lake shipping operator Ludwig Feßler and the Munich firm Krauss, after a horse-drawn carriage accident on the station-to-harbour run. In the winter of 1908/09 the terminus moved from the west to the east side of Prien station, shortening the line from 1.91 to 1.79 km. Bavaria extended the operating concession in 1986 until 2036.

The railway takes its name from the nearby lake and is used by visitors today to reach the shoreline and ferry terminals. It remains a part of the tourist experience that has connected people to the lake islands for generations.

Scheduled trains run only in the summer season, from late May to late September, with ten pairs daily between 9:30 and 18:23; the ride takes about eight minutes. A single train set is used, so there are no passing loops. The depot and workshop stand beside the terminus at Prien-Stock, next to the ferry landing.

The operation preserves not only locomotives but also nine original passenger cars from 1887, showing how travelers of that era traveled in comfort. These fully intact cars are rare examples of late 19th century rail vehicle design.