I just bought an unopened new old stock Bachmann Spectrum GP30. As per the instructions I am currently breaking it in. I have noticed that the loco makes an intermittent buzzing (almost like a horn) noise. Will this go away? Is this normal? What is this noise? It occurs far more frequently at low speeds. I have not taken the loco past 60% yet due to it not being fully brocken in. It has never even pulled a car to date. It is a Canadian Pacific Road Number 8200.