Applicability.

This subpart applies to each of the following owner/operators: (a) Described in § 1580.1(a)(1) of this part that is a Class I freight railroad. (b) Described in § 1580.1(a)(1) of this part that transports one or more of the categories and quantities of RSSM in an HTUA. (c) Described in § 1580.1(a)(4) of this part that serves as a host railroad to a freight railroad described in paragraph (a) of (b) of this section or a passenger operation described in § 1582.101 of this subchapter.