The Belfast to Bangor line (known simply as the Bangor line by NI Railways ) is a railway line in Northern Ireland, originally part of the Belfast & County Down Railway. All services are operated by NI Railways, the only operator for Northern Ireland (NI). Unlike the rest of the United Kingdom, no railway in NI is part of the National Rail network and none is owned by Network Rail. Services run every half-hour, with up to six trains per hour in each direction (3 express and 3 stopping services) at peak times. All NIR services on this line terminate at Belfast Grand Central stopping at stations in between. Until 2024, trains operated as through services between and or via and. Since the opening of Grand Central station, Bangor Line trains now terminate and start back from Grand Central, with services to Portadown and Newry operating separately from Grand Central.

Rail Air Link

The Belfast-Bangor Line is part of the key link into Belfast city centre. Trains run from to Sydenham for planes from George Best Belfast City Airport.

Museum rail access

The Bangor Line serves important museums including the Ulster Museum, where passengers can alight at Botanic and for the Ulster Folk & Transport Museum alight at Cultra. There is a private rail siding at Cultra which is used occasionally for access by the museum to the main rail network, but is not used by passenger services.

The Odyssey & Titanic Quarter

Passengers can alight at Titanic Quarter station for the Odyssey Arena and the Titanic Quarter.