A huge amount of money is needed for operating the Shinkansen, and the only companies with enough funds to shoulder such costs are the JR companies that have taken over operations of the Japanese National Railways.
新幹線の経営には莫大な費用がかかり、それを負担できる資本力があるのは日本国有鉄道の業務を継承したJR各社しか存在しない。