The Märkische Museum Railway (German: Märkische Museums-Eisenbahn) or MME is a German railway society that was founded in order to show narrow gauge vehicles in operation on small branch lines.
Found on 14 July 1982 at Plettenberg, the society used the opportunity to buy vehicles, that had formerly worked in the Sauerland, from the Juist and Spiekerooge island railways which had just closed.
The priority for their collection is the following railways: In Plettenberg the society could take over the remaining trackage from the PKB and set up a temporary workshop in an old boiler house in order to restore the vehicles acquired.
The society found a suitable site for the establishment of its 1,000 mm (3 ft 3+3⁄8 in) museum railway on the trackbed of the Plettenberg–Herscheid railway between Hüinghausen station and Köbbinghausen halt (formerly timetable route (Kursbuchstrecke or KBS) no.
Operations are carried out under the name of the Sauerland Light Railway (Sauerländer Kleinbahn).