Commencing with the year ending December 31, 1982, and thereafter, until further order, all railroad companies not required to file an Annual Report (Form R-1) shall compute their adjusted revenues using the railroad revenue deflator formula. If there is a change in a carrier's classification the survey form shall be filed with the Bureau of Accounts, Surface Transportation Board, Washington, DC 20423, on or before March 31. [48 FR 2544, Jan. 20, 1983]