Test of the Faller Car System 161674 Parkplatz. The permanent magnet inserted in the plywood roadbed will stop indefinitely the vehicle without the need of a power supply. A big solenoid is placed under the roadbed . I used two screws and two nuts I had in a drawer to fix the solenoid . Powered by the accessory 16vAC output of my Märklin regulator, I have used a pushbutton and wired a lamp in parallel to show you when I send the pulse.