Multiple railroad companies have laid lines in the three cities in Keihanshin, forming sections of railroad that would be competed over fiercely between JR and private railroad companies as well as among competing private companies, with respect to servicing and developing the areas along the railroads.
京阪神三都市間には複数の鉄道事業者が路線を敷設しており、サービスや沿線開発においてJRと私鉄、また私鉄同士による熾烈な競合区間となっている。