610 ILCS 15/4

The Illinois Commerce Commission shall investigate and ascertain whether the provisions of this act are violated by any railroad corporation. Whenever the facts warrant prosecution, the commission shall immediately cause suits to be commenced and prosecuted against any railroad corporation which has violated the provisions of this act. Actions may be instituted in any county through or into which the line of the corporation extends. Actions so commenced shall not be dismissed unless the commission and the attorney general shall consent thereto.