Section 580(b) in Police Regulations, Bengal , 1943
(b)The surveillance of bad characters as laid down in Chapter VI shall remain with the District Police. The watching of bad characters arriving and departing by train and generally within railway limits, however, is a matter for co-operation between the District and the Railway Police. Officers-in-charge of district police-stations may when necessary depute constables in plain clothes to the railway stations for this purpose. Only constables well-acquainted with the bad characters of the district shall be deputed. They shall always carry their appointment certificates to denote their identity.
