Any common carrier subject to the provisions of this chapter, or whenever such common carrier is a corporation, any director or officer thereof, or any receiver, trustee, lessee, agent, or person acting for or employed by such corporation, who, alone, or with any other corporation, company, person, or party, shall wilfully do or cause to be done, or shall willingly suffer or permit to be done, any act, matter, or thing in this chapter prohibited or declared to be unlawful, or who shall aid or abet therein, or shall wilfully omit or fail to do any act, matter or thing in this chapter required to be done, or shall cause or willingly suffer or permit any act, matter or thing so directed or required by this chapter to be done, or not to be so done, or shall aid or abet any such omission or failure, or shall be guilty of any infraction of this chapter for which no penalty is otherwise provided, or who shall aid or abet therein, shall be deemed guilty of a misdemeanor, and shall upon conviction thereof in any court of competent jurisdiction, be subject to a fine of not to exceed five thousand dollars for each offense.