(a) Except as otherwise ordered or permitted by the commissioner each Class I, Class II and Class III railroad subject to the jurisdiction of the commissioner is required to furnish such supplemental information as the commissioner might direct and to file such supplemental information for each calendar quarter of each calendar year on forms to be furnished by the department in accordance with the instructions of the commissioner.
(b) Each railroad required to file such supplemental information shall file one copy thereof, and such additional copies as the commissioner may direct not later than 30 days after the last day of the third calendar monthly covered thereby.
(c) All forms required by this Part may be obtained, upon request, at the principal office of the department. Failure of a railroad to obtain a copy of any form or the instructions with respect thereto shall not be in any respect, a reason or excuse for failure to file any report when due.
(d) All requests for waivers or modifications of all or part of the requirements of this Part shall be made in writing.