The light metro line first opened on September 3, 1989. As of 2015, it has two branches. Line M1A operates from Yenikapı to Havalimanı (Atatürk International Airport) making 19 stops over a distance of 12.6 miles. Line M1B operates from Yenikapı to Kirazlı making 13 stops over a distance of 8.7 miles. The rolling stock on this line was built by AAB and uses overhead catenary.