Photo: COWI

Monitoring and control, Citytunneln, Malmö, Sweden 

Citytunneln is a planned two-track electric railway tunnel under the central part of Malmö, Sweden. The design works are carried out in a joint venture between COWI and the Swedish company SWECO AB.

The tunnel is foreseen to go into operation in 2009. Citytunneln comprises the following main parts:

  • A 6 km long railway tunnel with two separate tubes, one for each track.
  • 13 cross passages that can be used as escape routes in case of an accident.
  • Two underground stations, Malmö C and Triangeln.
  • A station at terrain level, Hyllie.

The tunnel complex will be monitored and controlled from a central control room by means of the following systems:

  • SCADA system for monitoring and control of technical installations.
  • Closed Circuit Television system (CCTV).
  • Fire alarm system.

These systems will be fitted together constituting a functionally coherent integrated system for overall monitoring and control.

The SCADA system monitors and controls the technical installations in the stations and the tunnels. It comprises operator stations for centralised and decentralised operator communication and "intelligent" RTUs which are placed in equipment rooms in the cross passages and stations.

Furthermore it comprises a redundant fibre optical data network for data communication between the RTUs and the operator stations.

The SCADA system can carry out automatic control sequences that can be triggered by alarms or by operator commands. As an example, a fire alarm in a station will automatically activate smoke gas exhaustion, emergency lighting etc. for that specific station.