You need a permanent magnet for the conversion of old Märklin engines. It replaces the current field winding, and in combination with a LokSound or LokPilot decoder, helps to make your loco run amazingly smooth. We offer 4 different magnets, depending on the specific anchor. You will find the anchor code number on a spare parts plate, which you can download from www.maerklin.de

Permanent magnet such as 235690 and 245480, for anchor 231440, D = 19.1mm for motor mounting 231350