# Edges can have labels, too:
 [ Kempten ] - Bahn -> [ Schongau ]		# normal edge
 [ Schongau ] -Fahrrad-> [ Regensburg ]		# ditto
 [ Regensburg ] ..Auto ..> [ Roth ]		# dashed
 [ Regensburg ] = Motorradkolonne => [ Straubing ]	# double
