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I know almost nothing about electronics, or the terminology thereof in English, so this may sound funny: In many old locomotives you could see what looked like (and in fact I think was) two simple copper wire coils on black "cores". Those cores were actually black "sticks" (no idea what those were made of), about an inch long in HO. Sometimes those "devices" would be inside a tube made of some insulation material. They were connected (soldered) one to each motor contact, directly. I was told that those coils actually help reduce the interference with radio and TV signals. Those old locos also had a small ceramic disc capacitor connected directly to the motor contacts. Hope this helps, Oliver [:I]
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