For the retrofit of old Märklin all-current motors you need a permanent magnet.
Viessmann 8434 Marking Aid For Permanent Magnet Installation, H0
Permanent Magnet "between-the-rails" Delayed Uncoupler Kadee 321
ESU 51830 SwitchPilot 3 4-Fold Magnet Article Decoder NEW
ESU #41010 Premium Foam Train Service Tray 328x 166 x 68 mm. With Magnet Recess
ESU LokSound V5 DCC Sound Decoder & Speaker - ESU HIFI Diesel Sound Programmed
ESU 54671 ESU PowerPack Mini
