35 ILCS 200/11-115
In case any railroad company neglects to return to the Department any statements or schedules required to be returned to the Department, within the time required, the Department shall proceed to assess the property of the railroad company according to its best information and judgment at 33 1/3% of its fair cash value, and may add to the valuation thereof an amount equal to 50% of the valuation. If good cause is shown, the Department may, in its discretion, grant reasonable extensions of time for filing any required statement or schedule.
Anyone who makes any statement or schedule to the Department and wilfully swears falsely in any material matter shall be guilty of perjury and punished accordingly.
No railroad company wilfully refusing or neglecting to return any information required by this Code shall be heard to object to the legality of its assessment in any court of this state.
35 ILCS 200/11-115