 In 2007, 37 Citadis X04 trams were ordered from Alstom to replace the high-floor trams running on the T2 Zeytinburnu-Bağcılar line, in anticipation of the merger of the T1 and T2 lines and the conversion of the former T2 line platforms to low-floor height.The first tram was delivered in September 2009, and following testing the trams entered service in 2011.They also have a top speed of 70km/h, and a maximum capacity of up to 500 passengers as a coupled pair.