Section 102. Rates; discrimination; liability

Except  as  to  terminal
  warehouses, show rooms and factories, such  a  corporation  shall  be  a
  common   carrier.   Subject   to   regulation  by  the  commissioner  of
  transportation, such a corporation may make regulations  and  fix  rates
  for each class of its business. Such corporation shall impartially serve
  all   requiring  its  service  within  the  locality  described  in  its
  certificate of incorporation up to the maximum capacity of its plant and
  equipment. No receipt, certificate or order shall  be  made,  issued  or
  accepted  by  any such corporation for any commodity not actually in its
  possession.