Section 96. Grade crossing elimination debt fund

All moneys repaid to the
  state, both principal and interest, on account of advancements made  and
  to  be  made  to  railroad companies and the municipalities specified in
  section fourteen  of  article  seven  of  the  state  constitution  from
  proceeds  of  state  bonds  sold  or  to  be  sold to provide moneys for
  elimination of railroad crossings at grade shall, when received, be paid
  into and shall constitute a special fund in the state  treasury,  to  be
  known  as "grade crossing elimination debt fund." All such moneys repaid
  to the state prior to April eighteenth, nineteen hundred forty, and  not
  credited  to  the  general  fund,  shall  be  transferred  to such grade
  crossing elimination debt fund upon the taking effect of this act.  Such
  fund  shall  be  available  only  for  payment  of appropriations to pay
  installments of principal and interest on such bonds.  Appropriations in
  any year to pay installments of principal of and interest  on  any  such
  state  bonds  shall  first be paid from such special fund, so far as the
  amount of moneys therein will pay the same, and the remainder,  if  any,
  shall  be paid from any other moneys in the state treasury not otherwise
  appropriated.