(a)  Plan.⁠—In consultation with the States on the main line of the Northeast Corridor, the Secretary of Transportation shall develop a plan not later than September 30, 1993, to eliminate all highway at-grade crossings of the main line by not later than December 31, 1997. The plan may provide that eliminating a crossing is not required if⁠—

(1)  impracticable or unnecessary; and

(2)  using the crossing is consistent with conditions the Secretary considers appropriate to ensure safety.

(b)  Amtrak’s Share of Costs.⁠—Amtrak shall pay 20 percent of the cost of eliminating each highway at-grade crossing under the plan.