((a)) ** .—** Each State may prepare and maintain a State rail plan in accordance with the provisions of this chapter.

((b)) ** .—** The Secretary shall establish the minimum requirements for the preparation and periodic revision of a State rail plan, including that a State shall—

((1)) establish or designate a State rail transportation authority to prepare, maintain, coordinate, and administer the plan;

((2)) establish or designate a State rail plan approval authority to approve the plan;

((3)) submit the State’s approved plan to the Secretary of Transportation for review; and

((4)) revise and resubmit a State-approved plan no less frequently than once every 4 years for acceptance by the Secretary.