The initial plans of the Tehran Metro, which was to be Iran's first metro system, were laid out before the Iranian revolution in the 1970s. In 1970 the Plan and Budget Organization and the Municipality of Tehran announced an international tender for construction of a metro in Tehran. The French company SOFRETU, affiliated with the state-owned Paris transportation authority RATP, won the tender and in the same year began to conduct preliminary studies on the project. In 1974 a final report with a so-called "street-metro" proposal was tendered. The street-metro system recommended a road network with a loop express way in the central area and two highways for new urban areas and an 8-line metro network which were complemented by bus network and taxi services. Geological surveys commenced in 1976. In 1978 construction on the line was started in northern Tehran by the French company, however this development was short-lived with the advent of the Iranian Revolution and Iran–Iraq War in 1979 and 1980 respectively. SOFRETU ceased operations in Iran in December 1980. On March 3, 1982, the Iranian Cabinet ministers formally announced the stop of Tehran Metro operations by the French company.
In 1985, the "Tehran Metro Execution Plan" was re-approved by the Majles, the Iranian Parliament, on the basis of legal project of "Amendment of Law of Establishment of Tehran Urban and suburban Railway Company" which had been founded on Farvardin 1364 (April 1985). This was a literal continuation of exactly the same project that had been laid out before the revolution. Work proceeded slowly due to the continuing Iran–Iraq War and often ground to a halt.
By the summer of 1985, urban pressure from the rapidly urbanising population, and lack of developed public transport system prompted the work to be resumed in earnest. "Line 1" (From Blvd. Shahid Ayatollah Haghani to City of Rey) and its extension to Behesht-e-Zahra Cemetery was made a priority. "Line 2" (From Dardasht in Tehran Pars district to Sadeghiyeh Second Square) and an extending towards the City of Karaj and Mehrshahr district was also made a secondary priority. Studies were also made to establish the previously designed Lines 3 and 4. It was decided that an organisation by the name of the Metro Company should be established in order to handle the future development of the system.
Following this phase, the Metro Company was managed by Asghar Ebrahimi Asl for eleven years. During this time, hundreds of millions of dollars were spent on the system and the Metro Company was given government concessions for the exploitation of iron ore mines in Bandar Abbas (Hormuzgan Province), exploitation and sale of Moghan Diotomite mine in Azarbaijan Province, export of refinery residues from Isfahan oil refinery as well as tar from Isfahan steel mill . The year after Asghar Ebrahimi Asl left the management of the Metro Company and Mohsen Hashemi succeeded him, the first line of the Tehran Metro was launched between Tehran and Karaj.
On 7 March 1999, an overland Tehran-Karaj express electric train started a limited service of 31.4 km (19.5 mi) between Azadi Square (Tehran) and Malard (Karaj) calling at one intermediate station at Vardavard. The line was constructed by the Chinese company NORINCO.
Line 5 of the Tehran metro began operating in 1999 and was Iran's first metro system.
Golshahr {Line 5} rapid transit line stations.
From 2000 onwards, commercial operation began on Lines 1 and 2. The wagons on these lines are provided by CRV via CNTIC. The railway tracks and points on these lines are provided by the Austrian company Voestalpine.
The Metro uses equipment manufactured by a wide range of international companies: Double-deck passenger cars for the Tehran-Karaj regional line are supplied by CRV (although some trains are from SEGC) via CNTIC and assembled by the Wagon Pars factory in Arak.
As of 2010 approximately $2 billion has been spent on the Metro project. The Tehran Metro transports about 2.5 million passengers daily through its 5 operational lines (1, 2, 3, 4, 5) with two lines (1 and 3) are still being developed by Tehran Metro Company with another two lines (Lines 6, 7) under construction and line 8 in engineering phase. New 80 wagons have been added to the system in September 2012 to ease transportation and reduce rush-hour congestion. Iran is able to produce its need in wagons and trains independently.
A 2.8-kilometre (1.7 mi) branch line of Line 4 began running to Mehrabad International Airport on 15 March 2016.