The Molli (German: Mecklenburgische Bäderbahn "Molli"; short: MBB; also: Molli Bahn or Mollibahn)
A narrow-gauge steam-powered railway in Mecklenburg, Germany, running on 900 mm (2 ft 11+7⁄16 in) gauge track.
On 19 June 1886 Frederick Francis III, Grand Duke of Mecklenburg granted a licence for the construction and operation of a narrow gauge railway from Doberan station to Heiligendamm, this first section going into operation on 9 July 1886. It was built by the private railway construction and operating company of Lenz & Co. from Stettin (now Szczecin) and run by the Doberan-Heiligendamm Railway (DHE). Services on the 6.61-kilometre-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. On 13 March 1890 the Grand Duchy of Mecklenburg-Schwerin nationalized the line and incorporated it into the Grand Duchy of Mecklenburg Friedrich-Franz Railway.
It currently operates between Bad Doberan, Heiligendamm and Kühlungsborn West over a total distance of 15.4 km with a running time of 40 minutes. Within Bad Doberan the line currently runs through the street, and later along a linden tree-lined avenue.