The Minden museum railway (MEM) is an association registered in 1977. It offers voluntary historic (steam) railway trips from the locations of Minden and Preußisch Oldendorf. In the Weser town the "Prussian secondary line locomotive" is the symbol of this museum railway; it therefore represents the first epoch in German railway history. At the other location, coaches of Epoch III have been brought together, i.e. 1920s and 1930s construction years that continued to be in service many years later. Because secondary and local railway operations are offered, the coaches are almost all twin axle passenger wagons with open platforms and associated locomotives.
The "Minden Preußenzug" is unique in the Federal Republic of Germany. The steam locomotives were constructed between 1908 and 1912 and are appropriately painted in the Prussian state railway colours of dark green and dark red with decorative lines. The wagons are coloured according to their travelling classes in green (2nd class), brown (3rd class) and grey (4th class). They were extensively refurbished according to original drawings, resulting in MEM receiving recognition from specialists from the heritage protection sector. MEM has three tank engines in its inventory as well as ten passenger and cargo wagons and several freight wagons for the transport of bicycles and coal.