R.I. Gen. Laws § 12-2-2: Badges to be worn or carried by officers.

Every officer commissioned under this chapter shall, when on duty and in uniform, wear in plain sight a metallic badge inscribed with the words “railroad police” and the name or initials of the corporation for which he or she is appointed, or “steamboat police” according to his or her appointment. When not in uniform, the officer must carry a badge while on duty.