The Canadian National Police Service is a private railway police force protecting the property, personnel, and rail infrastructure of the Canadian National Railway in Canada and the United States.

Private police or special police are types of law enforcement agencies owned and/or controlled by non-government entities. Additionally, the term can refer to an off-duty police officer while working for a private entity, providing security, or otherwise performing law enforcement-related services; officers engaging in private police work have the power to enforce the law, however, terminology and authority vary by jurisdiction.