The design of this machine is a mess inside. The power is taken from the wheels with a soldered wire for the positive and with a screw that attach the little circuit to the chassis. And power to the motor is given by a soldered wire for negative, and through a week contact for the positive.
I can't figure out why it needs resistances, reel and other electronic stuff to run a small train... I tested the motor and it runs perfect, I also installed again the dummy and the wrong behavior was also reproduced in DC.
Finally, I removed everything and install a simple NEM connector and a Decoder. Now the nurse discharged the patient.
