1. The form for all reports required under sections 137.1000 to 137.1030 shall be prescribed and furnished by the commission.

2. If any freight line company refuses or fails to make and return the reports required by sections 137.1000 to 137.1030 within the time prescribed and without an extension of time, the commission shall increase by four percent the total assessed valuation of the distributable property of any such company, unless the commission, for good cause shown, waives such penalty.

3. Any such reports delivered by United States mail to the proper official or officer designated shall be deemed to be received as of the postmark date stamped on the envelope or other cover in which such reports are mailed. In the event any report is sent by registered or certified mail, the date of registration or certification shall be deemed the postmark date. No penalty shall be imposed on any company whose reports are delivered by United States mail, if the postmark date stamped on the envelope or other cover containing such reports falls within the prescribed period or on or before the prescribed date, including any extension granted for making the report.

4. Every railroad or street railway company operating in this state shall file annually, on or before May first of each year, a true and accurate statement of the main line track mileage of such company in operation in each county of this state on December thirty-first of the preceding year, total mileage traveled on their track by railroad cars of the freight line companies and other information the commission may require for the purpose of carrying out its duties under sections 137.1000 to 137.1030. Such reports shall be made in such manner and form as prescribed by the commission.

5. In addition to the reports required by subsection 2 of this section, each freight line company shall file a similar report at the same time and in such manner as said commission shall prescribe showing the total mileage traveled on track from railroad and street railway companies, date and original cost of acquisitions and other information the commission may require for the purpose of carrying out its duties under sections 137.1000 to 137.1030.

6. In case any freight line company shall fail to make such report the commission may accept the report of said railroad or street railway company as correct.