; (2) performing focused inspections; or (3) developing agency rulemakings and guidance, as appropriate. (h) Definition of applicable railroad carrier In this section, the term applicable railroad carrier means a railroad carrier that— (1) is a Class I railroad; (2) has inadequate safety performance, as determined by the Secretary; or (3) provides intercity rail passenger or commuter rail passenger transportation. (i) Authorization of appropriations There are authorized to be appropriated to the Secretary such sums as may be necessary— (1) to implement this section