Engineering Company

METRO Line C – Route T4 - Rome

The Third Metro of Rome called Line C, is the metro line that directly connects the city areas along the North-Western and South-Eastern axis.
The metro line passes underneath the Tiber river and the old town centre of Rome, it reaches Pantano, an outlying administrative division of the municipality of Montecompatri, passing along the axis of the Casilina street beyond the Rome ring road. The planned route makes the doubling of the extension of the currently existing urban metro possible. The new Line C, thanks to its high technology, is already a model for the future metro. It is in fact the first big Italian public transport infrastructure, that is entirely guided and remotely controlled by a full automation system.
Once it is finished, the most modern metro of our country will give Rome a railway public transport network similar to those of many European cities. It will be able to carry 600.000 people a day, being capable of carrying 60.000 passengers in the rush hours.
The urban planned route is divided into stretches of route (Tratta), according to functional and project needs. The fundamental part of the planned route called ‘Tratta T4’ is the underground route that, from the Malatesta station, in the Malatesta square, goes to the San Giovanni station, nearby the Basilica.
The Route T4 is developed along a 3 km run with 4 stations:

  • San Giovanni, exchange junction with line A
  • Lodi
  • Pigneto
  • Malatesta

and it has a 3km average lenght, a 0,01km minimum depth and a 0,03km maximum depth.
The Opengineering company, for the above mentioned works, took care of the Executive Planning of the stations and galleries electric installations and special systems, starting from the LV energy supply.
The areas where the interventions took place are the following ones:

  • main switch panels
  • secondary switch panels and particular power consuption unit switch panels
  • primary and secondary distribution
  • motive power output
  • secondary ground system
  • safety and ordinary lighting system

All the power consumption units of the stations and galleries are powered, in compliance with the ministerial decree 11.1.88, by two automatically convertible alternative electric energy sources. Moreover, in each station, the energy consumption units that need an absolute continuity power supply are powered by UPS. The gallery systems are partially divided among the systems of the interconnected stations; with the exception of the ventilation systems of the wells along half of the route, that are powered by 1 transformer vault, that can be powered by two automatically convertible alternative electric energy sources. The electric installations power two fundamental types of energy consumption units:

  • the “normal” energy consumption units for which power supply can possibly be provided by the two MV/LV vaults, alternatively
  • The “NO-BREAK” energy consumption units for which power supply can possibly be provided by the two MV/LV vaults, as above, but by means of the static no-break power. Some “NO-BREAK” energy consumption units (about 20% of the lighting devices) will be provided with battery power supplier for the accomplishing of the safety lighting

The galleries lighting is accomplished by means of two systems, separated from an electric point of view, called “no-break system” and “reserve system”. The no-break system is usually on, whereas the reserve system is usually off. The reserve system can be activated, through the remote control, by the supervision system simultaneously with the no-break system, fot maintenance interventions and in the event of the evacuation of a train in the gallery.
The safety lighting system (included the safety warning signs) is accomplished by providing about 20% of the devices of the power supplier emergency light (inverter with 1 hour autonomy batteries). The lighting devices belonging to the systems “safety light” and “no-break“, are placed in such a way as to favour the areas where the devices that are subject to manual manouvres during an emergency are located. The safety lighting system is provided with a control central unit that can execute recurrent functional and autonomy tests. The anti-intrusion system ensures the control of the access in the technical premises and in the gallery, through the ventilation shafts. The system is controlled by a central unit, that is autonomous from a functional point of view and that is self-powered and interfaced with the general Supervision and Control System.
The fire detection system of tha stations has the task to signal possible fires in their initial phase, by means of interactive fire and heat detectors : the signals sent to the control central unit enable the operator to react with the appropriate countermeasures and to activate the planned intervention provisions, in compliance with the ministerial decree 11/1/1988, “Norme di prevenzione incendi nelle metropolitane” (Fire prevention rules in the underground railways). In the galleries instead, the fire detection is executed by means of a heat linear detection system that can give information about the size, location and direction of the fire.


Metro Line C - Route T4 - Rome


Metro C S.p.A.




Executive Planning for Special Systems and Electric Installations

Task assigned by

3D System S.r.l.

System Amount

7.657.229,78 €