Section 221. Duty of railroad commissioners

It shall be the duty of the
  railroad commissioners of the town, any part of  whose  territory  shall
  have been detached as aforesaid, to render a true statement to the board
  of  supervisors,  as required by law, of the amount necessary to pay the
  proportionate share belonging to the territory detached from their town,
  which may be then coming due, and the board  of  supervisors  shall  add
  such  proportionate  share  to the sums to be collected from the town so
  formed, or to the part which shall have been detached from  a  town  and
  added to another town, to be collected as prescribed by law.