Signalling System
There are multiple signalling systems used. Line 2, the first one that has been modernized, uses Bombardier's Automatic Train Control system. It ensures the protection (Automatic Train Protection) and operation (Automatic Train Operation) of the new Bombardier Movia trains.
The system uses an IPU (Interlocking processing unit), TI21-M track circuits and EbiScreen workstations. Signals have been kept only in areas where points are present, but only use a white light, meaning that the route has been assigned and the driver can use cab signalling. Trains are usually operated automatically, with the driver only opening and closing the doors and supervising the operation. Other features include auto turnback and a balise system, called PSM (precision stop marker). This ensures that the train can stop at the platform automatically.
On lines 1 and 3, where IVA trains are still in service, the ATC system has been merged with the Indusi system. Signals are present in point areas and platform ends. Along with the three red-yellow-green lights, the white ATP light has been added. Optical routes can be assigned, meaning that a train gets a green light (permission to pass the signal) only after the next signal has been passed by the train ahead, or a yellow light, meaning that the signal can be passed at low speed. Automatic Block signals have been removed.
Line 4 uses ATC Dimetronic, and Line 5 is expected to use the same system.
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