As mortgagor the Sultan was certain to insist upon the recognition and protection of certain rights. To assure observance by the concessionaires of their obligations under the convention, supervision over construction, operation, and maintenance of the railway was vested in the Ministry of Public Works, represented by two Imperial Railway Commissioners. As a guarantee of good faith the Company was obliged to deposit with a Constantinople bank a bond of £30,000, subject to release only upon the completion of the entire line. The Ottoman Government was determined, also, that the concession, far-reaching as were its implications, should not lead to additional extra-territorial rights, or “capitulations,” in favor of foreign powers. The concessionaires were forbidden to contract for the transportation of foreign mails, or to perform other services for the foreign post offices in Turkey, without the formal approval of the Ottoman Government. It was specified, also, that, inasmuch as the Anatolian and the Bagdad Railway Companies were Ottoman joint-stock corporations, all disputes and differences between the Government and the Companies, or between the Companies and private persons, “arising as a result of the execution or interpretation of the present Convention and the Specifications attached thereto, shall be carried before the competent Ottoman courts.” It was further provided that the concessionaires “must correspond with the State Departments in Turkish, which is the official language of the Imperial Ottoman Government!”[56]