İETT History
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 “Istanbul inner city transportation begins with the foundation of Dersaadet Tram Company and the construction og Tunel facilities in 1869.”

Istanbul inner city transportation begins with the foundation of Dersaadet Tram Company and the construction og Tunel facilities in 1869. In 1871 the first horse drawn tram was launched. In 1913 the first electricity factory of Turkey was founded and then in February 1914 electrical tram enterprise begins. First busses were bought in 1926. Operated by various foreign companies up to 1939, electricity, tram and tunnel enterprises were nationalized under the law no: 3645 in 1939 and reached its present identity under the name of IETT. 
In 1945, Yedikule and Kurbağalıdere air gas factories and Istanbul and Anatolia air gas distribution systems maintained by them were transferred to IETT. In Europe electrical trams were abolished in 1961 and 1966 in Anatolia. Trolleybusses set into operation in 1961 provided service to Istanbulites till 1984. After a law enacted in 1981 all electricity services were transferred to Turkish Electricity Institution (TEK) with all rights and responsibilities. The service of air gas production and distribution came to an end after the arrival of natural gas in 1993. Providing service only in inner city transportation, IETT is responsible of managership of bus, tram and tunnel as well as of management, execution and control of Private Public Transportation Busses. In addition, IETT undertook the construction of some parts of the rail system (metro and light metro) of Istanbul (Eminönü-Kabataş, Sultançiftliği-Edirnekapı, Edirnekapı-Topkapı, Otogar-Başakşehir).   
When the calendars show September 2007, Metrobus came into play as a brand new and specifically designed system for Istanbul. Offering service between Avcılar-Topkapı at the first stage, metrobus connected two sides of the city with the shortest route by expansion to Söğütlüçeşme after one year. Metrobus project that is the first system connecting two continents in the world brought national and international awards to IETT. In 2010, with the aim of constituting and popularizing a public transportation culture, it is decided to celebrate every beginning of December as “Public Transportation Week”. In order to compensate constantly growing demand of travelling in Istanbul and to support the present fleet of IETT, Otobüs A.Ş. was founded in 2011 May with the affiliation of Istanbul Metropolitan Municipality. After the completion of the quality standardization efforts conducted within IETT in 2011, ISO 9001 Quality Management System, ISO 14001 Environmental Management System and OHSAH 1800 Occupational Health and Safet documents were approved by SGS. Also, IETT took part in “National Quality Movement” enforced by KalDer. IETT busses were decided to be yellow and white checkered in 2012. To lower the average age of the IETT fleet under 5, environment friendly, air conditioned, comfortable and suitable for the access of the disabled, 0 low floored busses with Euro V standard were purchased. With the intent of reducing the traffic intensity of Istanbul, bus lane implementation has been put into practice towards the end of 2012.
 
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