It operates between Bad Doberan, Heiligendamm and Kühlungsborn West over a total distance of 15.4 km (9.6 mi) with a running time of 40 minutes.

Services on the 6.61-kilometre (4.11 mi)-long route, which was worked by a steam tram and later classified as a light railway or Kleinbahn, initially only ran during the summer season from 1 May to 30 September.

This railway company is not to be confused with the Mecklenburgische Bäderbahn AG, which opened the Rövershagen Kleinbf - Graal-Müritz line on 1 July 1925, running it until 1949 when East Germany's Deutsche Reichsbahn took over the enterprise.

On 27 February 1997, the Mecklenburgische Bäderbahn Molli, together with the transport companies of Rostocker Straßenbahn, DB Regio AG Nordost, Regionalverkehr Küste, Weiße Flotte and antaris founded the Warnow Transport Association (Verkehrsverbund Warnow).

Since then, the Molli Railway accepts weekly and monthly passes from the association's range of services.

99 331 (later 99 2331), is working and acts as a reserve or as a train locomotive in winter (due to its lower risk of derailment).

Owing to the low tourist demand in the winter, half the trains are cancelled and replaced by the so-called Mollibus.

It was released in 1989 on the AMIGA LP "Wenn du ok Plattfööt hest" (if you have flat feet too).

Since the 1990s, the Molli has also been one of the main ways of getting to the Zappanale, a festival held every summer dedicated to the music of Frank Zappa.

The site for the past few years has been the Gallopenrennbahn (racecourse) about halfway between Bad Doberan and the coast.