In the future, there are planned branch lines from Zeytinburnu to Bakırköy, from Kabatas to Beşiktaş, and from Eminonu to Bayrampasa. This line may further run from Bağcılar to Spor Salonu in future. There may be a new line from Kadıköy to Bostancı on the Asian side (if built, it would follow the original Istanbul tram Route 4).