Kaukauna police report the discovery of human remains in a burned car sitting on abandoned railroad tracks Saturday morning.  It’s believed only one person died inside that car.  Kaukauna Fire Department officials say it’s not known how the car fire was started.  The flames were out by the time emergency responders arrived.  Authorities haven’t identified the person whose skeletal remains were in the vehicle.  It isn’t even clear how it came to be parked on the unused railroad tracks.