(b) Reduction in Competition.—
(1) Action by commission.— If, at any time after the filing or effective date of an agreement under chapter 403 of this title, the Commission determines that the agreement is likely, by a reduction in competition, to produce an unreasonable reduction in transportation service or an unreasonable increase in transportation cost, the Commission, after notice to the person filing the agreement, may bring a civil action in the United States District Court for the District of Columbia to enjoin the operation of the agreement. The Commission’s sole remedy with respect to an agreement likely to have such an effect is an action under this subsection.
(2) Remedies by court.—
In an action under this subsection, the court may issue—
(A) a temporary restraining order or a preliminary injunction; and
(B) a permanent injunction after a showing that the agreement is likely to have the effect described in paragraph (1).
(3) Burden of proof and third parties.— In an action under this subsection, the burden of proof is on the Commission. The court may not allow a third party to intervene.