Section 19. Railroads through Indian lands

Any railroad corporation may
  contract with the chiefs of any nation of Indians, over whose  lands  it
  may  be  necessary to construct its railroad, for the right to make such
  road  upon  such  lands,  but  such  contract  shall  not  vest  in  the
  corporation  the  fee  to the land, nor the right to occupy the same for
  any purposes other than may be necessary for the construction, occupancy
  and maintenance of such railroad, and such contract shall not  be  valid
  or  effectual  until  it  shall  be  ratified by the county court of the
  county where the land shall be situated.