Utilizing the risk assessment and National Strategy for Railroad Transportation Security required under section
1161 of this title, the Secretary shall assign each railroad carrier to a risk-based tier established by the Secretary:
(1)
Provision of information
The Secretary may request, and a railroad carrier shall provide, information necessary for the Secretary to assign a railroad carrier to the appropriate tier under this subsection.
(2)
Notification
Not later than 60 days after the date a railroad carrier is assigned to a tier under this subsection, the Secretary shall notify the railroad carrier of the tier to which it is assigned and the reasons for such assignment.
(4)
Reassignment
The Secretary may reassign a railroad carrier to another tier, as appropriate, in response to changes in risk. The Secretary shall notify the railroad carrier not later than 60 days after such reassignment and provide the railroad carrier with the reasons for such reassignment.