Section 657. Agreement with the state

The state does hereby pledge to and
  agree with the holders of any notes or bonds issued under  this  article
  that  the  state will not limit or alter the rights hereby vested in the
  corporation to fulfill the terms of any agreements made  with  the  said
  holders  thereof,  or  in any way impair the rights and remedies of such
  holders until such notes and bonds, together with the interest  thereon,
  with  interest on any unpaid installments of interest, and all costs and
  expenses in connection with any action or proceeding by or on behalf  of
  such   holders,  are  fully  met  and  discharged.  The  corporation  is
  authorized to include this pledge and agreement  of  the  state  in  any
  agreement with the holders of such notes or bonds.