I have just fitted a TTS sound decoder to a new Railroad Class 31 loco purchased off a well known auction site. Being new to this game I could not understand why it ran perfectly in analogue mode before fitting the decoder, but then with the decoder fitted it kept shooting forward about a foot at anything above 1/4 throttle at regular intervals around the track. I read a couple of posts about the motor capacitor so thought it was worth a try. I managed to drop the power bogie down far enough to get at the capacitor and just snipped through one of its legs in such a way as to be able to resolder it together if the experiment failed. Problem solved! Speed is now perfectly steady at all throttle openings and the surging has totally disappeared. No evidence of any TV or radio interference anywhere so it will remain snipped!
