The Belfast–Derry line (referred to as the Derry~Londonderry Line by NI Railways^[2]) is an intercity railway line, running from Belfast to Derry in Northern Ireland.

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Belfast–Derry Line
NI Railways Class 3000 at Castlerock
Overview
Status	Operational
Owner	Translink
Locale	Northern Ireland
Termini	Belfast Grand Central Derry~Londonderry / Coleraine
Stations	15
Service
Type	Heavy rail Commuter rail
System	NI Railways
Services	Belfast-Derry Belfast-Coleraine
Operator(s)	NI Railways
Rolling stock	Class 3000 (C3K) Class 4000 (C4K)
Ridership	4,578,499 (2023/24) [1]
Technical
Number of tracks	Double track from Belfast to Monkstown Single line with passing loops from Monkstown to Derry~Londonderry
Track gauge	1,600 mm (5 ft 3 in) Irish gauge
Electrification	Un-electrified
Operating speed	90 mph (140 km/h)
Route map (Click to expand) Show map Legend Year closed Great Victoria Street 2024 Belfast Grand Central Belfast-Dublin line to Portadown, Newry, Dublin Connolly City Hospital Botanic Lanyon Place River Lagan Belfast-Bangor line to Holywood, Helen's Bay, Bangor Lagan Viaduct over River Lagan Cross Harbour Rail Link over Belfast Harbour York Street Yorkgate 2024 York Road depot York Road 1992 Fortwilliam Traincare Depot Whiteabbey Belfast-Larne line to Carrickfergus, Whitehead, Larne Town Belfast-Derry line via Greenisland 1963 Monkstown 1981 Mossley 1982 Mossley West Ballyclare Junction 1961 Ballyclare branch line to Lisnalinchy, Ballyclare 1930 Ballyrobert 1920 Doagh 1970 Templepatrick 1981 Dunadry 1954 Muckamore 1961 Lisburn-Antrim line to Crumlin, Knockmore, Lisburn Antrim Cookstown Junction 1976 Cookstown branch line to Randalstown, Cookstown 1955 Kellswater 1971 Andraid 1850 Ballymena and Larne Railway to Kells, Kilwaughter, Larne Town 1950 Ballymena Ballymena, Cushendall & Red Bay Rly to Rathkenny, Parkmore, Retreat 1940 Cullybackey Glarryford 1973 Killagan 1973 Dunloy 1976 Ballymoney Ballycastle Railway to Dervock, Armoy, Ballycastle 1950 Derry Central Railway to Garvagh, Kilrea, Magherafelt 1950 Macfin 1954 Coleraine Coleraine Harbour 1963 Coleraine-Portrush line to University, Dhu Varren, Portrush River Bann Coleraine Waterside 1861 Barmouth 1856 Castlerock Castlerock Tunnel Downhill Tunnel Downhill 1973 Umbra 1861 Magilligan 1976 Bellarena River Roe Limavady Railway to Limavady, Dungiven Limavady Junction 1976 Ballykelly 1954 Carrichue 1954 Faughanvale 1859 Eglinton 1973 River Faughan Derry~Londonderry This diagram: view talk edit Show route diagram

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The line is double-track on the short section it shares with the Belfast–Larne line, but is composed primarily of single track from Monkstown to Derry with passing points at Templepatrick, Antrim, Magherabeg, Ballymena, Killagan, Ballymoney, Coleraine and Bellarena.

The line is the busiest single track railway line in the United Kingdom, carrying over 4 million passengers per annum,^[3] the Derry-Londonderry Line has also been described by Michael Palin as "one of the most beautiful rail journeys in the world".

Weekday and Saturday services on the line run hourly from Grand Central in Belfast to Derry~Londonderry and vice versa, with some late-night and peak-time services starting from and terminating at Coleraine and Lanyon Place. Hourly shuttle services to and from Portrush connect with the line at Coleraine.

On Sunday, the service operates hourly from Grand Central, however the outbound terminus alternates every hour between Derry~Londonderry and Portrush – with the effect that stations beyond Coleraine have a two-hourly service.

Between 1978 and 2001, the line between the Bleach Green viaduct and Antrim was closed so services operated via Crumlin, Glenavy, Ballinderry and Lisburn. The reopening of the Bleach Green viaduct resulted in shorter journeys between Belfast and Derry.^[4] A skeleton service continued on the Lisburn–Antrim line until 2003, when the line and its stations were closed. This section of railway is now used solely for driver training or other operational requirements e.g. special services to major events.

In 2011, it was planned to reduce services on the Coleraine to Derry~Londonderry section to five services, in each direction on weekdays, to facilitate safety improvement works during refurbishment of the line due to commence in 2012, but the £75 million that it was to cost was unavailable. This led to fears that the line would be permanently closed.^[5] Regional Development minister Danny Kennedy relocated funding from the A5 dualling project to the railway upgrade project, allowing for a 3-phase upgrade.

Phase 1 saw the line close for nine months to completely relay two sections (Coleraine to Castlerock; and Eglinton to Derry), extending the life of the remaining section by converting the jointed track to continuous welded rail, elimination of wet spots, and essential bridge repairs. This was completed by 2013, and timetable changes resulted in a morning train reaching Derry before 9 a.m. for the first time since Northern Ireland Railways took control of the network in the 1960s.

Phase 2 saw the passing loop removed and the 'down' track lifted at Castlerock, replaced with a new loop further down the line at Bellarena halt. New signalling was introduced, and the signal boxes at Castlerock and Waterside, Derry closed, with the line operating under absolute block. An hourly service between Belfast and Derry was introduced in 2017.^[6]

Phase 3 will include rail renewal between Castlerock and Eglinton, the introduction of a 90 mph (140 km/h) line speed between Castlerock and Derry and other works, however funding for this part of the project is doubtful for the foreseeable future.

Other future plans for the Derry line include the reinstatement of the double line from Antrim to Ballymena, and the doubling of the track from Monkstown to Templepatrick. The route terminus in Derry was relocated in 2019 when the former Belfast and Northern Counties Railway Waterside station reopened, replacing the 1980 terminus.

Coleraine has a bascule bridge for the railway over the navigable River Bann.^[7] Just after Castlerock station there are two tunnels created during an event known as the Great Blast in October 1845.^[8] Castlerock tunnel is 668 yards (611 m) long and is the longest operational railway tunnel in Northern Ireland.^{[citation needed]} After passing through a short opening trains pass through the shorter Downhill tunnel which is 301 yards (275 m) in length.^[9]

Signalling on the line from Belfast Grand Central to Slaught level crossing (just south of Ballymena station) is controlled by the Belfast Lanyon Place control terminal. From Kellswater South, the signalling and level crossings are controlled by the Coleraine signal cabin. Following the signalling upgrade in 2016, the line north of Coleraine is no longer controlled by electric token, instead being centralised in the Coleraine signal box. The signal boxes at Castlerock and Waterside, which previously controlled the token system, have now been closed. The whole of the Belfast to Derry line is now controlled by colour light signals, the last semaphore signals at Castlerock station being removed after the 2016 signalling upgrade.

This section needs to be updated. The reason given is: Needs to be updated now that this is largely past tense.. (October 2024)

The signal box at Coleraine will be moved to Lanyon Place upon completion of the Belfast Hub project.

Due to capacity issues on the line, Northern Ireland Railways announced they would be purchasing 21 extra carriages from Spanish manufacturer CAF. These units entered service in 2021. The line is typically served by 6 car Class 4000 sets, however, 3 car Class 3000s and Class 4000s sometimes operate on the line.