Although the OU-0801 road will take you all the way to O Barco, there are arrows which take you onto much more scenic trails through the forest. Eventually, you will find yourself back on the road. Keep an eye out for a blue camino sign indicating the way to your left and under the train tracks. Go under and turn to your left where you will take a gravel track (the gravel in these parts is overspill from the train tracks and is not the best to walk on). O Barco is near enough.