The history of rail transport in Ireland began only a decade later than that of Great Britain. By its peak in 1920, Ireland had 3,500 route miles (5,630 km). The current status is less than half that amount, with a large unserviced area around the border area between Northern Ireland and The Republic of Ireland.

William Dargan MRDS was arguably the most important Irish engineer of the 19th century and certainly the most important figure in railway construction. Dargan designed and built Ireland's first railway line from Dublin to Dún Laoghaire in 1833. In total he constructed over 1,300 km of railway to important urban centres of Ireland. He was a member of the Royal Dublin Society (RDS) and also helped establish the National Gallery of Ireland. He was also responsible for the Great Dublin Exhibition held at Leinster lawn in 1853. His achievements were honoured in 1995, when the Dargan Railway Bridge in Belfast was opened, and again in 2004 when the Dargan Bridge, Dublin a new cable stayed bridge for Dublin's Light Railway Luas were both named after him.