However, many companies other than those belonging to the JR group (bus-operating companies owned by private railway line companies, companies specialized in route bus operations, and chartered membership-based tour buses as well) have entered this business in a short period of time, generating competitive situations with Shinkansen lines.
しかしながら、JRグループ以外の競合会社（私鉄・専業系路線バスのほか、貸切バスによる会員制ツアーバスもある）の進出も急増し、各JR新幹線と実質競合している。