If any person shall wilfully obstruct or impede any officer or agent of any railway company in the execution of his duty upon any railway, or upon or in any of the stations or other works or premises connected therewith, or if any person shall wilfully trespass upon any railway, or any of the stations or other works or premises connected therewith, and shall refuse to quit the same upon request to him made by any officer or agent of the said company, every such person so offending, and all others aiding or assisting therein, shall and [F1may be seized and detained by any such officer or agent, or any person whom he may call to his assistance, until such offender or offenders can be conveniently taken before some justice of the peace for the county or place wherein such offence shall be committed, and when convicted, before such justice as aforesaid, (who is hereby authorized and required, upon complaint to him . . . F2 to take cognizance thereof, and to act summarily in the premises,) shall, in the discretion of such justice,][F1, upon conviction by a magistrates’ court, at the discretion of the court,]forfeit to her Majesty any sum not exceeding [F3level 1 on the standard scale][F4£200 [F5level 3 on the standard scale]], [F6and in default of payment thereof shall or may be imprisoned] . . . F7