St Marys is a railway station on the Western line, Sydney of the CityRail network. It has four tracks, and the tracks are paired by direction down/down/up/up. This means that all trains to the city leave from the same island platform, so if a train happens to travel on the unexpected track, it is merely a matter of walking to the other side of the island platform. All four platforms can have trains terminated on and sent back to the origin station. St Marys platforms are accessible by lifts, and is therefore classified as an Easy Access station for wheelchairs. The station is served by two trains per hour each way, with additional trains during weekday peak hours.