national rail passenger transportation system

(A) the segment of the continuous Northeast Corridor railroad line between Boston, Massachusetts, and Washington, District of Columbia;

(B) rail corridors that have been designated by the Secretary of Transportation as high-speed rail corridors (other than corridors described in subparagraph (A)), but only after regularly scheduled intercity service over a corridor has been established;

(C) long-distance routes of more than 750 miles between endpoints operated by Amtrak as of the date of enactment of the Passenger Rail Investment and Improvement Act of 2008; and

(D) short-distance corridors, or routes of not more than 750 miles between endpoints, operated by—

(i) Amtrak; or

(ii) another rail carrier that receives funds under chapter 229.

(A) the segment of the continuous Northeast Corridor railroad line between Boston, Massachusetts, and Washington, District of Columbia;

(B) rail corridors that have been designated by the Secretary of Transportation as high-speed rail corridors (other than corridors described in subparagraph (A)), but only after regularly scheduled intercity service over a corridor has been established;

(C) long-distance routes of more than 750 miles between endpoints operated by Amtrak as of the date of enactment of the Passenger Rail Investment and Improvement Act of 2008; and

(D) short-distance corridors, or routes of not more than 750 miles between endpoints, operated by—

(i) Amtrak; or

(ii) another rail carrier that receives funds under chapter 244.