
The Stockholm Metro
On workdays, half a million passengers take over a million trips on the Metro by way of the 100 or so stations.
Solutions
- Cactus CSX
The Stockholm Metro
On workdays, half a million passengers take over a million trips on the Metro by way of the 100 or so stations.
Solutions
Solutions
Technical details
On workdays, half a million passengers take over a million trips on the Metro by way of the 100 or so stations. In the downtown district, Metro trains depart every 2 to 5 minutes on weekdays.
Back in the 1930s, an underground Metro was planned for Stockholm. It would be the cornerstone of the city’s rapid transit system. However, implementation was postponed due to WWII, but construction took off after the war. Today, the Metro is comprised of three lines that each have their own control centres.
It started with an alarm collection system
In 1991, Cactus received its first commission from SL (Stockholm Transit): A complete turnkey alarm collection system to monitor all the stations in the Metro system. At that time, the system’s operator workstations had excellent graphic performance. This was a feature SL’s technicians valued highly. This project had a substantial impact on future developments of the Cactus TMS system. The company’s ability to deliver the system and the features required, on time and on budget, meant that Cactus was one of the companies SL turned to when they needed to upgrade their TMS system.
Redundant fibre network
The original system consisted of three servers, one server per control centre. Nowadays, the system has been upgraded to include a centralised doublecomputer system with distributed workstations. SL’s redundant fibre network is also a vital component of the total system solution. This fibre network is immune to external electrical interference, and it is designed as a ring network to ensure operations even in the event of failures.
Shared management
Today, SL is in charge of the centralised management of both the Metro and the other technical systems connected to the operational centre.
The Cactus alarm logging system supports this operational centre by collecting important alarm data from all the Metro stations and all Cactus subsystems. The specific features have changed over the years: Today, the system provides more passenger information by way of the loudspeaker control features, and it plays a vital role with regard to safety issues as well, since it monitors stations for fire and other hazardous events.
Central statistics server
Cactus has also provided a centralised statistics server. Extensive data storage and reporting features for all the subsystems are some of the benefits.