If the doing of the work requires a change of grade of any railroad track or tracks, the legislative body shall direct the clerk to mail to the owner or reputed owner or operator or reputed operator thereof, at its last known address as the same appears on the tax rolls of the city, the legislative body of which is conducting the proceeding, or when no address so appears then to such owner or operator in care of general delivery in such city and to the Public Utilities Commission, printed copies of the resolution of intention within five days after the first publication thereof. Failure to mail said copies or failure of any such owner or operator to receive the same or any erroneous address thereon shall not affect the jurisdiction of the legislative body, but in such event the failure of the owner or operator of such tracks to make objection to the proposed grades shall not be deemed to be a waiver of all objections to the proposed grades or proposed change or modification of grade, nor operate as a bar to any claim for damages, if recoverable damages there be.