Help please ....for two months now I have been trying to get this turntable to work.  Even two electricions are stumped.  If I am hooked up to the fourth rail ONLY, it works.  When I hook up any other rails to the layout it either kills the track completely or the train will get on the turntable track and not move.  We have tried putting in reverse polarities.  Last night I rebuilt the track completely and eveything worked until I set up additional tracks.  I am a Mom so I so confused over this.  Has anyone else ever encourtered this problem?