The network is a hybrid metro-suburban railway with a central underground core, it has been claimed to be more of a rapid transit system than a commuter railway as it shares more characteristics with the former rather than the latter.
The network is a hybrid metro-suburban railway with a central underground core that serves 182 stations over 815km of track. It is often described as more of a rapid transit system than a commuter railway as it shares more characteristics with the former rather than the latter.