Most of the transport system in Ireland is in public hands, either side of the Irish border. The Irish road network has evolved separately in the two jurisdictions into which Ireland is divided, while the Irish rail network was mostly created prior to the partition of Ireland.
A standard-gauge railway is a railway with a track gauge of 1,435 mm. The standard gauge is also called Stephenson gauge, international gauge, UIC gauge, uniform gauge, normal gauge and European gauge in Europe, and SGR in East Africa. It is the most widely used track gauge around the world, with about 55% of the lines in the world using it.
Transport in the United Kingdom is highly facilitated by road, rail, air and water networks. Transport is a devolved matter with each of the countries of the United Kingdom having separate systems under separate governments.
A broad-gauge railway is a railway with a track gauge broader than the 1,435 mm used by standard-gauge railways.
In rail transport, track gauge is the distance between the two rails of a railway track. All vehicles on a rail network must have wheelsets that are compatible with the track gauge. Since many different track gauges exist worldwide, gauge differences often present a barrier to wider operation on railway networks.
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.
A light railway is a railway built at lower costs and to lower standards than typical "heavy rail": it uses lighter-weight track, and may have more steep gradients and tight curves to reduce civil engineering costs. These lighter standards allow lower costs of operation, at the price of lower vehicle capacity.
In railway engineering, "gauge" is the transverse distance between the inner surfaces of the heads of two rails, which for the vast majority of railway lines is the number of rails in place. However, it is sometimes necessary for track to carry railway vehicles with wheels matched to two different gauges. Such track is described as dual gauge – achieved either by addition of a third rail, if it will fit, or by two additional rails. Dual-gauge tracks are more expensive to configure with signals and sidings, and to maintain, than two separate single-gauge tracks. It is therefore usual to build dual-gauge or other multi-gauge tracks only when necessitated by lack of space or when tracks of two different gauges meet in marshalling yards or passenger stations. Dual-gauge tracks are by far the most common configuration, but triple-gauge tracks have been built in some situations.
Australians generally assumed in the 1850s that railways would be built by the private sector. Private companies built railways in the then colonies of Victoria, opened in 1854, and New South Wales, where the company was taken over by the government before completion in 1855, due to bankruptcy. South Australia's railways were government owned from the beginning, including a horse-drawn line opened in 1854 and a steam-powered line opened in 1856. In Victoria, the private railways were soon found not to be financially viable, and existing rail networks and their expansion were taken over by the colony. Government ownership also enabled railways to be built to promote development, even if not apparently viable in strictly financial terms. The railway systems spread from the colonial capitals, except for a few lines that hauled commodities to a rural port.
Rail transport in South Africa is an important element of the country's transport infrastructure. All major cities are connected by rail, and South Africa's railway system is the most highly developed in Africa. The South African rail industry is publicly owned.
Rail gauges in Australia display significant variations, which has presented an extremely difficult problem for rail transport on the Australian continent since the 19th century. As of 2022, there are 11,914 kilometres (7,403 mi) of narrow-gauge railways, 18,007 kilometres (11,189 mi) of standard gauge railways and 2,685 kilometres (1,668 mi) of broad gauge railways. In the 19th century, each of the colonies of Australia adopted their own gauges.
The Isle of Man has a rich transport heritage and boasts the largest narrow-gauge railway network in the British Isles with several historic railways and tramways still in operation. These operate largely to what is known as "Manx Standard Gauge" and together they comprise about 65 miles (105 km) of Victorian railways and tramways. The Isle of Man Railway Museum in Port Erin allows people to find out more about the history of the Manx railways, and was until 1998 accompanied by a similar museum in Ramsey, which was dedicated to the history of the electric line, but this was closed and converted into a youth club. The steam railway to the south of the island, electric to the north and mountain line to the summit of Snaefell, the island's only mountain, are all government-owned, and operated under the title Isle of Man Railways, as a division of the island's Department of Infrastructure. The lines at Groudle Glen and Curraghs Wildlife Park are both privately owned but open to the public.
The Dublin United Transport Company (DUTC) operated trams and buses in Dublin, Ireland until 1945. Following legislation in the Oireachtas, the Transport Act, 1944, the DUTC and the Great Southern Railways were vested in the newly formed Córas Iompair Éireann on 1 January 1945.
Rail transport in Europe is characterized by the diversity of technological standards, operating concepts, and infrastructures. Common features are the widespread deployment of standard-gauge rail, high operational safety and a high share of electrification. Electrified railway networks operate at a plethora of different voltages AC and DC varying from 750 to 25,000 volts, and signaling systems vary from country to country, complicating cross-border traffic.
There have been two railways within the state territories of the Bailiwick of Guernsey, a British Crown Dependency comprising six inhabited islands.
There are several planned railway lines in Rwanda, including a line to Tanzania. Historical railways are limited to three industrial railways.
The track gauge adopted by the mainline railways in Ireland is 1,600 mm. This unusually broad track gauge is otherwise found only in Australia, in the states of Victoria, southern New South Wales and South Australia, as well as in Brazil.
Railways with a track gauge of 5 ft 3 in fall within the category of broad gauge railways. As of 2022, they were extant in Australia, Brazil and on the island of Ireland.
The history of rail transport in Burundi is limited to a now closed industrial railway, and a number of proposed railway projects that, as of 2012, had not been implemented.
