The final system plan shall be based upon due consideration of all factors relevant to the realization of the goals set forth in subsection (a) of this section. Such factors include the need for and the cost of rehabilitation and modernization of track, equipment, and other facilities; methods of achieving economies in the cost of rail operations in the region; means of achieving rationalization of rail services and the rail service system in the region; marketing studies; the impact on railroad employees; consumer needs; traffic analyses; financial studies; and any other factors identified by the Association under section
712
(b) of this title or in the report of the Secretary required under section
714
(a) of this title.