Upon written notice to the Department of Transportation, to the chief executive officer of a private transit system, and to the elected chief executive officer of each municipality composing the district, the district, by its board of directors, may assume all powers of the Department of Transportation to regulate and supervise the operation of any such transit system within the district, provided that such transit system would be subject to the supervision of the department except for this section. Upon assuming such supervision the district, by its board of directors, shall establish passenger fares and any other rates to be charged and shall establish service standards, may order abandonment of uneconomic routes and shall exercise all powers of regulation and supervision over such transit system as are conferred on the department by title 16, in the same manner and under the same standards as are established by said title 16. Any company, town, city, borough, corporation or person aggrieved by any order, authorization or decision of the board of directors, except an order, authorization or decision approving the taking of land, in any matter to which he or it was or ought to have been made a party, may appeal therefrom to the department within thirty days after the filing of such order, authorization or decision. The party so appealing shall give bond to the state, with sufficient surety, for the benefit of the adverse party, in such sum as the board of directors fix, to pay all costs in case he or it fails to sustain such appeal. To the extent applicable, such appeal shall conform to the standards and procedure for appeals in contested cases under sections 4-176e to 4-182, inclusive. Where the department determines that the order, authorization or decision of the transit district would affect state-wide transportation policy adversely, such order, authorization or decision may be modified or overruled. The decision after hearing shall be final except that the applicant for such hearing, if aggrieved, may appeal therefrom in accordance with § 4-183. The district may use any grants, loans or other revenues for subsidies to any transit system operating under private ownership within the district in order to continue the operation of uneconomic routes. Subsidies may be provided for that portion of such uneconomic routes which operate outside the transit district but which are integrated into the service provided in the district.