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Iraqi Republic Railways Company (IRR; الشركة العامة لسكك الحديد العراقية) is the national railway operator in Iraq.

IRR comprises of 4ft8.5in. IRR has one international interchange, with Chemins de Fer Syriens (CFS) at Rabiya. The system runs from Rabiya southward through Mosul, Baiji, and Baghdad to Basra, with a branch line from Shouaiba Junction (near Basra) to the ports of Khor Az Zubair and Umm Qasr, westward from Baghdad through Ramadi and Haqlaniya to Al Qaim and Husayba, with a branch line from Al Qaim to Akashat, and east west from Haqlaniya through Bayji to Kirkuk.

The first section of railway in what was then the Ottoman Empire province of Mesopotamia was a length of the Baghdad Railway between that city & Samarra opened in 1914. Work had started northwards from Baghdad with the aim of meeting the section being constructed across Turkey and Syria to Tel Kotchek and an extension northwards from Samarra to Baiji was opened in December 1918. From 1916 onwards an invading British Military force brought narrow gauge equipment, firstly 2ft6in gauge and later 1000 gauge from India to Southern Mesopotamia to construct various sections of line to support its offensive against the Turks. Britain defeated the Ottomans and Mesopotamia became a League of Nations mandate under British administration. In April 1920 the British military authorities transferred all railways to a British civilian administration, Mesopotamian Railways. The metre gauge line from Basra to Nasiriyah was the most important section constructed during the war in terms of its significance as part of later efforts to construct a national railway network. Soon after the end of World War I this was extended northwards from Ur Junction outside Nasiriyah up the Euphrates valley with the complete Basra to Baghdad route being opened on 16 January 1920. The other section of metre gauge line built during World War I that had ongoing significance was that from Baghdad East north eastwards to the Persian border. After the war the eastern end of this line was diverted to Khanaqin and the wartime built line north west from Jalula Junction was extended from Kingerban to Kirkuk in 1925. From 1941 onwards the UK War Department supplemented ISR's locomotive fleets: the metre gauge with HG class 4 6 0s requisitioned from India and new USATC S118 Class 2 8 2's from the US, and the standard gauge with new LMS Stanier Class 8F 2 8 0s and USATC S100 Class 0 6 0T's. In 1947 the Iraq Petroleum Company opened a branch at Kirkuk, which it operated with its own Hudswell Clarke 2 8 4T's from 1951. ISR opened a new metre gauge line from Kirkuk to Arbil in 1949. A joint road and rail bridge was opened across the River Tigris in Baghdad in 1950, finally connecting the east and west bank metre gauge systems. metre gauge 2 8 2's from Ferrostaal of Essen and 10 from Vulcan Foundry in 1953 and 20 more from Maschinenfabrik Esslingen in 1955 56 and 2 8 0s from Krupp, plus standard gauge 2 8 0s also from Krupp. In 1958 when Iraq's Hashemite monarchy was overthrown and a republic declared, ISR was renamed Iraqi Republic Railways. and Alco. In 1972 several classes of steam locomotive were still in service on the standard gauge system, but these were replaced by further classes of diesel from Alstom, Montreal Locomotive Works and MACOSA. In 1964 IRR extended its standard gauge network with a line from Baghdad to Basrah which opened for freight in 1964 and for passengers in 1968. It has since been extended from Shouaiba Junction to the port of Umm Qasr.

The IRR Southern Line, also known as the Baghdad Basra Railway Line, is the currently only rail route in Iraq that is fully operational. The line stretches 550 kilometres to Basra Al Maqal railway station with a Branch line to Karbala and another one from Shoeyba Junction to Um Qasr.

The IRR Northern Line connects the capital of Baghdad with the northern city of Mosul and then to the international interchange at Rabiyaa. The line is currently in reconstruction. The Section from Baghdad and Taji, a northern suburb of Baghdad, is the only section currently in sporadic use.

The Line connects Baghdad to the phosphate mining village of Akashat. The only section currently in use in the form of a commuter rail line is the 65 kilometre long section from Baghdad to Falluja.

This rail line connects Haditha, where it intersects with the IRR Western, over Baiji, where it connects to the IRR Northern, to Kirkuk in the north east of Iraq. It is the only major route to not run to Baghdad. The line is fully out of operation.

In around October 2008, a commuter service resumed between Baghdad Central and the southern suburb of Doura. There is a nightly service between Baghdad and Basra and a Friday only pilgrims service to Samarra. In March 2009, a weekly service started between Baghdad and Fallujah. The Baghdad Mosul line is almost ready for passenger services to resume. Transport Minister Abdul Jabbar Ismail said that he hoped to extend the existing network of 1243 mile (2000 km) to between 2485 mile (3999 km) and 3107 mile (5000 km) but that there were obstacles such as budget restraints and contract approvals. CSR Sifang Co Ltd. is supplying 10 new trains in 2014.

In 1936, the Iraqi State Railways owned 114 locomotives, 8 railcars, 320 coaches and 3485 goods wagons.

ClassImageAxle formulaNumberYear in servicePower[hp]ConstructorNotesDHS 101 3BBBo Bo31986600Nippon SharyoNot in service anymoreDHS 111 3BBBo Bo31973600Nippon SharyoNot in service anymoreHG Class4 6 0 1907 Robert Stephenson & Company One seen as 132 in 1967. Originally built for Burma Railways. Exported to Iraq later. V Class0 4 0T1910BorsigOne seen as 208 in 1967 on display in Shalchiyah. W Class2 8 21943Alco One seen as 63 in 1967.2 8 4T31951Hudswell ClarkeNos. 1 3. Y Class2 8 2101953Vulcan FoundryOne seen as 80 in 1967Z Class2 8 21956Esslingen One seen as 96.

Syrian Railways had been extending a rail route from Deir ez Zor Junction towards the modern Husaibah branch terminus on the Iraqi side of the border, which was built as a through station. The route follows the Euphrates river valley and Google Earth shows the route complete to the border, including a new customs exchange yard, but requiring of formation on the Iraqi side. The civil war in Syria and insurgency in Iraq have prevented further progress in the last decade. This route would be more direct than the existing one via the border station at Tall Kushik.

In August 2011, the Jordanian government approved the construction of the railway from Aqaba to the Iraqi border (near Traibil). The Iraqis in the meantime started the construction of the line from the border to their current railhead at Ramadi.

In 2011, a line between Baghdad and Basra was planned, with the Iraqi Railways and Alstom designing the route. It started operations since 2014, and at that time not classified as a true high speed rail. New trainsets for use on the Baghdad Basra route were unveiled in China in February 2014 before being shipped to Iraq.

In December 2021, Iran and Iraq agreed today to build a railway connecting both countries. The project would connect Basra in southern Iraq to Shalamcheh in western Iran. There are only around 30 kilometers (18 miles) between the two areas. The railway would be strategically important for Iran, linking the country to the Mediterranean Sea via Iraq and Syria’s railways.

IRR uses Soviet style SA3 couplers. In order to allow interchange with CFS and Turkish State Railways which both use screw couplers, IRR locomotives and most wagons are equipped with screw couplers and buffers. In Iraqi service the buffers do not make contact and the screw couplings hang down unattached.