Sydenham railway station is located in the townland of Ballymisert in east Belfast, and is within walking distance of Belfast City Airport and Victoria Park.[3] The station is unstaffed, and was opened on 1 November 1851.
Mondays to Saturdays there is a half-hourly westbound service towards Belfast Lanyon Place in one direction, and a half-hourly eastbound service towards Holywood and Bangor in the other, with extra services at peak times.
In the evenings, the service reduces to hourly operation. Some peak-time express trains will pass through this station without stopping.
On Sundays there is an hourly service in each direction.