This is an alphabetical listing of cities and countries that have commuter or suburban railways that are currently operational and in service. Commuter and suburban rail systems are train services that connect city centres with outer suburbs or nearby cities, with most passengers traveling for work or school. Unlike metros or light rail these systems usually operate on main line tracks unsegregated from other rail traffic. They differ from regional rail in that they usually have a hub-and-spoke paradigm and are focused on moving large number of passengers to a central business district. List See also Lists of rapid transit systems List of metro systems List of tram and light rail transit systems List of town tramway systems List of monorail systems List of rail transit systems in the United States S-Bahn List of airport people mover systems List of funicular railways List of trolleybus systems List of bus rapid transit systems List of premetro systems Notes References Suburban and commuter rail systems Passenger rail transport