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The train in question is an E231-500 series motor car which is at least 4 years of age, and has a (I think) 3-pole motor with flywheels on either side. Normally (as everyone who models knows lol) when the power is turned to moderate speed on the powerpack (mine is a Kato standard S) the motor begins to operate and the head/taillights on either side of the train light up. However, this time when the motor car is placed on the track, the head and taillights of the leading cars flicker off, the motor car does not move and a slight odour of electrical burn is emitted from the powerpack vent. If I turn the speed all the way up on the powerpack, the green power lamp on the powerpack turns off with a click (then I push the re-start button) and the controller returns to normal. I suspect that there is a short circuit in the motor (all the bogies and copper plates on the motor car are touching in normal position) but I do not know where. Does anyone have solutions to the problem?