The board of supervisors of a county or the governing authority of a municipality may, with the approval of the Mississippi Department of Transportation, appropriate funds from the county or municipal general fund to the Railroad Revitalization Fund. The money shall be used in accordance with this chapter only for rehabilitation or improvement of rail lines within the county from which the county or municipal funds are provided. The county or municipality may, according to the provisions of Section 57-43-3, Mississippi Code of 1972, receive a partial or total reimbursement for this appropriation.