The Railway Protection Force Act,1957
Section 12. Power arrest without warrant
Any superior officer or member of the Force may, without an order from a Magistrate and without a warrant, arrest-
(a) Any person who has been concerned in an offence relating to railway property punishable with imprisonment for a term exceeding six months, or against whom a reasonable suspicion exists of his having been so concerned; or
(b) Any person found taking precautions to conceal his presence within railway limits under circumstances which afford reason to believe that he is taking such precautions with a view to committing theft of, or damage to, railway property.