I'm brand new to Lionel O gauge so please excuse the terminology if I'm using it wrong. I bought an off the shelf LionChief set, some extra track and a few switches and set up in the basement. Everything ran fine for two weeks. Today, I plugged in the power and the locomotive began running at high speed without the remote on. The locomotive wouldn't move though, the traction wheels just spun in place. I unplugged, waited a few minutes and tried again. Same thing. I don't see anything visible that would cause this, track is clean, power is clean, no shorts etc. Help!!!