In addition, a wide pantograph allows the contact wire stager to be increased in curves, thus saving the amount of poles needed. The later main lines electrification uses a small clearance gauge, requiring a 1,6 m pantograph. Indeed this small gauge induces great savings when laying catenary in Turkey's numerous tunnels, way offsetting the cost of the additional poles. This is the right choice that was not made in 1955 for lack of knowledge I presume. Line side signs warn the drivers when to switch from one to the other.
Engines working only the Ankara and stanbul suburbs require only the large pantograph.
Engines working the Divri i skenderun line requires only the small pantograph. The large pantograph is raised. The size difference can be easily seen. These motors are connected all in parallel and fed by a 22 positions tap changer with electrical drive. This very small batch of locomotives using a technology that was dropped a few years after never proved to be very reliable.