Martin Place railway station is a station on the CityRail Eastern Suburbs railway line, located under Martin Place in the CBD of the city of Sydney, Australia. Annual ridership to/from Martin Place railway station is 5.5 million journeys. It consists of an underground island platform and a turnback siding with an underground concourse between the platform and street level. Escalators connect the concourse with the platforms. A service tunnel extends from Martin Place railway station under Sydney Hospital into The Domain. The tunnel carries air conditioning services from an underground room, which is located beneath two ventilation towers in The Domain, by the side of the road behind Sydney Hospital. The station is served by six to eight trains per hour each way, with additional trains during weekday peak hours.