public void addDropRS(){
  int old=_dropRS;
  _dropRS++;
  setDirtyAndFirePropertyChange("locationAddDropRS",Integer.toString(old),Integer.toString(_dropRS));
}

public void addDropRS ( ) { int old = _dropRS ; _dropRS ++ ; setDirtyAndFirePropertyChange ( "locationAddDropRS" , Integer . toString ( old ) , Integer . toString ( _dropRS ) ) ; }
increments the number of cars and or engines that will be dropped off by trains at this location .
