Transit police in the context of "Common carrier"

A coast guard or coastguard is a maritime security organization of a particular country. The term embraces wide range of responsibilities in different countries, from being a heavily armed military force with customs and security duties to being a volunteer organization tasked with search and rescue without law enforcement authority. In most countries, a typical coast guard's functions are distinct from those of the navy (a military service) and the transit police (a law enforcement agency), while in certain countries they have similarities to both.

The BART Police (BARTPD), officially the Bay Area Rapid Transit Police Department, is the transit police agency of the BART rail system in the U.S. state of California. The department has approximately three hundred police personnel, including over two hundred sworn peace officers. The chief, Kevin Franklin commands the agency's law enforcement, parking, and community relations services. BART Police participates in a mutual aid agreement with other Bay Area law enforcement agencies. In 2011 and 2012 the department came under national scrutiny due to several officers involved in fatalities of the rail system's patrons.

When terrorism began to be treated as a more active threat after the September 11 attacks, BART increased its emphasis on infrastructure protection. The police department hosts drills and participates in counter-terrorism working groups. The agency has an officer assigned full-time to the FBI's Joint Terrorism Task Force. Furthermore, a command officer is designated as a mutual-aid, counter-terrorism, and homeland-security liaison. BART's police dogs are certified in explosives detection.

The Port Authority of New York and New Jersey Police Department, or Port Authority Police Department (PAPD), is a law enforcement agency in New York and New Jersey, the duties of which are to protect and to enforce state and city laws at all the facilities, owned or operated by the Port Authority of New York and New Jersey (PANYNJ), the bi-state agency running airports, seaports, and many bridges and tunnels within the Port of New York and New Jersey. Additionally, the PAPD is responsible for other PANYNJ properties including three bus terminals (the Port Authority Bus Terminal, the George Washington Bridge Bus Station and Journal Square Transportation Center), the World Trade Center in Lower Manhattan, and the PATH train system. The PAPD is the largest transit-related police force in the United States.

The New Jersey Transit Police Department (NJTPD) is a transit police agency of the New Jersey Transit Corporation in the state of New Jersey. As provided by NJS Title 27:25-15.1, New Jersey Transit Police Officers have "general authority, without limitation, to exercise police powers and duties, as provided by law for police officers and law enforcement officers, in all criminal and traffic matters at all times throughout the State and, in addition, to enforce such rules and regulations as the NJ Transit Corporation shall adopt and deem appropriate."

The primary focus of NJTPD is providing police services to the numerous bus depots, rail and light rail stations throughout New Jersey. The New Jersey Transit Police Department is the only transit police agency in the United States with statewide authority and jurisdiction.