edge { arrowstyle: filled; }
graph {
  colorscheme: x11;
  flow: south;
  title: graph0;
}

[ Cottbus ] { label: Cottbus; }
[ berlin ] { label: Berlin Ost; }
[ bonn ] { label: Bonn am Rhein; }
[ bonntest ] { label: Bonn (Rhei  n); }

[ bonn ] -- train (ICE) --> [ berlin ]
[ bonntest ] --> [ Cottbus ]