The Milan -- Bologna line had been built as a single track .
Milan was divided between the two companies : passengers departed from Milan on a Mediterranean Network train and changed at Parma or Piacenza to an Adriatic Network train to reach Bologna .
The Milan -- Bologna line had been built as a single track , so it was divided between the two companies : passengers departed from Milan on a Mediterranean Network train and changed at Parma or Piacenza to an Adriatic Network train to reach Bologna .