The Roslagsbanan line was Sweden’s first electric railway. It is almost 70 km long, and narrow gauge. When the line was threatened with closure, SL decided to renew the rolling stock, renovate the stations and lay new rails and sleepers in a huge project that also involved replacing the 30-year-old operational monitoring equipment.
In the early 1990s, Cactus was asked to supply a new traffic management system.
Constant improvements to the line, including new interlocking systems, have required Cactus to demonstrate great flexibility and adaptability.
All traffic monitoring is handled from a control room. This has a row of six screens that provide an overview of the whole line. Each station has its own direct link to the central system. Out at every station there is either a PLC and relay interlocking or a newer electronic interlocking system. Altogether these handle some 3,700 indications and 2,300 commands.
The system is based on traditional centralised interlocking functions, which means remote control and feedback from every station. But the system can do a lot more:
Vehicle types: X10p, UBp, UBxp
Number of vehicles: 101
Route length: 76 km
Track length: 88 km
Number of stations/stops: 39
Number of points: 132
Number of signals: 332
Track gauge: 891 mm
Max speed: 80 km/h