List of suburban and commuter rail systems

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 doing work or school commuting. Unlike metros, these systems usually operate on main line tracks unsegregated from other rail traffic. And unlike light rail, they also usually have lower service frequencies but generally offer multiple services throughout work days and peak hours.