Amendments to be in writing and to be approved No amendment of any provision of this contract shall be effective unless:
Amendments to be in. Writing This agreement may not be --------------------------- amended except in a writing signed by the parties.
Amendments to be in writing and to be approved No amendment of any provision of this contract shall be effective unless such amendment is in writing and signed by, or on behalf of, the parties and, subject to Clause 18.2.2, has been approved by the Office of Rail & Road.
