70 ILCS 2205/20

Whenever it shall be necessary to take or use, for any of the purposes contemplated in this act, any portion of any railroad right of way, or property occupied by the track or tracks of any steam, electric, or other railroad company, or any street, highway, wharf, levee or other property, in the operation or use of which the public has an interest, only such easement, use or rights therein shall be acquired as are necessary for the purposes intended; and so far as practicable the use of any such street, highway, wharf, levee, right of way, or property, shall remain in and be reserved to the public, company, or persons otherwise entitled thereto.