(2)
The Board may require a rail carrier to include in a through route substantially less than the entire length of its railroad and any intermediate railroad operated with it under common management or control if that intermediate railroad lies between the terminals of the through route only when—
(B)
inclusion of those lines would make the through route unreasonably long when compared with a practicable alternative through route that could be established; or
(C)
the Board decides that the proposed through route is needed to provide adequate, and more efficient or economic, transportation.
The Board shall give reasonable preference, subject to this subsection, to the rail carrier originating the traffic when prescribing through routes.