Dargan Bridge, built in the 1990s, is a railway bridge

Bridge

A bridge is a structure built to span physical obstacles such as a body of water, valley, or road, for the purpose of providing passage over the obstacle...

 in Belfast

Belfast

Belfast is the capital of and largest city in Northern Ireland. By population, it is the 14th biggest city in the United Kingdom and second biggest on the island of Ireland . It is the seat of the devolved government and legislative Northern Ireland Assembly...

, Northern Ireland

Northern Ireland

Northern Ireland is one of the four countries of the United Kingdom. Situated in the north-east of the island of Ireland, it shares a border with the Republic of Ireland to the south and west...

. This bridge spans the River Lagan

River Lagan

The River Lagan is a major river in Northern Ireland which runs 40 miles from the Slieve Croob mountain in County Down to Belfast where it enters Belfast Lough, an inlet of the Irish Sea. The River Lagan forms much of the border between County Antrim and County Down. It rises as a tiny fast...

 and connects the railway lines to Larne

Larne

Larne is a substantial seaport and industrial market town on the east coast of County Antrim, Northern Ireland with a population of 18,228 people in the 2001 Census. As of 2011, there are about 31,000 residents in the greater Larne area. It has been used as a seaport for over 1,000 years, and is...

 and Derry

Derry

Derry or Londonderry is the second-biggest city in Northern Ireland and the fourth-biggest city on the island of Ireland. The name Derry is an anglicisation of the Irish name Doire or Doire Cholmcille meaning "oak-wood of Colmcille"...

 (via Bleach Green) to those east Bangor

Bangor, County Down

Bangor is a large town in County Down, Northern Ireland. It is a seaside resort on the southern side of Belfast Lough and within the Belfast Metropolitan Area. Bangor Marina is one of the largest in Ireland, and holds Blue Flag status...

 and south to Newry

Newry

Newry is a city in Northern Ireland. The River Clanrye, which runs through the city, formed the historic border between County Armagh and County Down. It is from Belfast and from Dublin. Newry had a population of 27,433 at the 2001 Census, while Newry and Mourne Council Area had a population...

 and the Republic

Republic of Ireland

Ireland , described as the Republic of Ireland , is a sovereign state in Europe occupying approximately five-sixths of the island of the same name. Its capital is Dublin. Ireland, which had a population of 4.58 million in 2011, is a constitutional republic governed as a parliamentary democracy,...

. It runs mostly parallel to the Lagan Bridge (opened 1995) carrying the M3 motorway

M3 motorway (Northern Ireland)

The M3 is an urban motorway 0.8 miles in length owned by Siac Construction and Cintra, S.A. that connects the M2 in north Belfast, Northern Ireland to the A2 Sydenham Bypass in east Belfast. It is the shortest motorway in Northern Ireland, and one of the busiest, carrying 60,000 vehicles per...

 across the Lagan. One of the first people to cross it was Mr John Johnston, the first Station Manager of Belfast Central Station and his grandson James Currie.

The name commemorates William Dargan

William Dargan

William Dargan , an engineer, often seen as the father of Irish railways, came from Killeshin, County Laois, Ireland. Born in 1799, he constructed Ireland's first railway from Dublin to Dún Laoghaire in 1833. He constructed over of railway to important urban centres of Ireland...

, who was involved in bringing railways to many parts of Ireland.

Limitations

Unfortunately, this bridge was built during a period of declining rail traffic so it was constructed to only a single width with a passing point in the centre. Now that passengers are at a near record, this severely limits the number of trains that can use it to 24 per hour.