Case Study Matterhorn Gotthard Bahn

The Matterhorn Gotthard Bahn offi- The Matterhorn Gotthard Bahn MGBahn – running the Glacier- ces have a 24-7 connection to the (MGBahn) is one of the largest transit Express between Zermatt and the Gri- central servers of the power control companies in Switzerland. With more sons destinations of Chur, Davos, and system in Brig and Glisergrund via than eight million passengers per St. Moritz. With the expansion of the redundant Ethernet switches. They year, the company is an important partially single-track lines to double use virtual coupling, which means infrastructure service provider for track, rail transport has become even that if a Layer 3 switch fails, the other regional tourism. The 144-kilometer more appealing to visitors to the device takes over its function, thus rail network passes through the fasci- region. securing both the control and moni- nating countryside of Disentis in the toring of the traction power supply of canton of Grisons over the Oberalp- Around three years ago, the enginee- all lines. pass at more than 2000 meters alti- ring section of MGBahn asked Sie- tude to Andermatt in the canton of mens to plan and implement an Uri. From there, it continues via Realp upgrade of the existing control sys- through the Furka base tunnel to tem for the traction power supply, Oberwald in the canton of Valais, and including the network infrastructure. via Brig and Visp on up to Zermatt Project manager Jean-Pierre Wald- below the Matterhorn. In Disentis, it mann, responsible for technical infra- connects to the Rhaetian Railway structures at MGBahn, describes it in (RhB) – a joint operation with these terms: „Efficient management

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Caischavedra Disentis/Mustér

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© 2016 Matterhorn Gotthard Bahn of the rail network requires know-how and the right solu- Partitioning of the process LAN tions. We want to know what is happening on the line at Siemens decided to use the Ruggedcom RX1500 for this all times. That applies equally to tracking trains on their solution. The RX1500 is a multi-service network compo- routes, to fast location and elimination of faults along the nent that combines the Ethernet functions of a switch, line and in the requirement-based traction power supply.“ router and firewall with WAN connectivity. The robust The installed network infrastructure with older devices Ethernet switch and TCP/IP router is designed for use in will be upgraded with components that are not only high-performance automation networks. The combined modern, but also easier to manage and maintain. device ensures high reliability with hot-swappable media modules and power supplies. The primary additional In the past, the structure was highly complex. There was a benefit for the user is flexible expansion with the media duplicate network with separate switches and routers. modules. Also critical in the decision for selecting the The entire system frequently failed if malfunctions occur- RX1500 was the product’s robust design, capable of with- red. Raymond Püntener, the Siemens project manager standing high levels of electromagnetic interference, responsible for the MGBahn project, planned a solution shock and vibration, along with flexibility in the input vol- based on two Layer 3 switches – for faster and more flexi- tage range and the extended temperature range without ble modification of the network. According to Püntener: cooling fans. „The redundant design makes one virtual switch out of two devices. If one device fails, the other device automa- The network of the control system needed to be divided tically takes over its function.“ into several virtual LANs (VLANs) i.e. the process LAN for checking the booking or customer information systems. A Layer 3 switch, like the Ruggedcom RX1500, is ideal for this task. In addition, the Virtual Router Redundancy Pro- tocol (VRRP) feature incorporated into the RX1500, provi- des a method that ensures the availability of the network. © Siemens AG 2017

At MGBahn, the two RX1500 switches at separate locations became one logical unit, a virtual router. The existing structure was initially broken down and the process LAN was subdivided into ten VLANs. The traction power supply is controlled via the Brig and Glisergrund stations. The two locations are around four kilometers apart and redundantly connected via glass fiber. If one of the RX1500 switches fails, the other takes over the gateway function immediately.

Employees at the Brig power system control center cons- tantly monitor the quality of the electricity supply. Indivi- dual switching of the overhead lines is carried out by the control system. The instructions are routed through the network of the control system to the relevant substations. Along the line, the control center monitors and controls the 44 stations, with seven stations connected together to form a single VLAN. If a malfunction occurs on a line segment, the affected segment is disconnected without disturbing the remaining power system operation. Because the messages are sent directly to the control system, an employee can send the service team straight to the affected line segment. The network infrastructure was implemented using Layer 3 switches and virtual routing. As a multiservice network component, the Ruggedcom RX1500 combines the Ethernet functions of a switch, router and firewall. (© Raymond Püntener)

Employees at the control center of Brig station monitor and control the power supply of the entire line network. (© Raymond Püntener) © Siemens AG 2017

Commissioning of the systems According to Waldmann, having one point of contact for any service related The approximately ten-year-old hard- inquiries is also a big advantage. ware of both locations has been A service technician is able to diagnose replaced by new systems, as the control system at any time through upgrading the installed equipment secured remote maintenance via Inter- would have been technically and eco- net. Personnel can set values and trans- nomically infeasible. Siemens first set fer program updates by remote access. up the hardware and software in a This results in shorter response times. testing environment. The simulation Service call-outs can often be avoided demonstrated perfect interaction of altogether. all components and showed that the switching commands arrive at the MGBahn benefits from the innovative destination as planned. functions of the new control system. It integrates the existing infrastructures The project started by replacing the with the new hardware and software installed systems with a leaner hard- components into the Brig and Gliser- ware infrastructure. Püntener exp- grund stations. At the core of the new lains: infrastructure are two Layer 3 switches „Because we had built a redundant whose routing functions enable com- system (A + B), we were able to con- munication between the various IP sub- vert system A of the power system networks and the high-performance control center to the new IP structure automation network. The new infra- first and test it. Once we had a suc- structure improves fault detection, cessful result, system B was also accelerates power system recovery, and converted.“ increases reliable power supply throug- hout the entire MGBahn rail network. Substantial benefits from the new Security information control systemm In order to protect plants, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holis- The project manager at MGBahn is ext- tic, state-of-the-art industrial security concept. remely satisfied with the new solution. Siemens’ products and solutions only form one Jean-Pierre Waldmann explains: element of such a concept. For more information about industrial security, please visit „Without intelligent power supply net- http://www.siemens.com/industrialsecurity works, it is not possible to handle the stringent requirements of automated railroad operation. Siemens showed us Siemens AG Process Industries and Drives how existing distribution networks can Process Automation be made fit for the future with the new Postfach 48 48 control system. Significant advantages 90026 Nürnberg Germany in maintenance and operation and sub- stantially simpler routing are the result.“ © Siemens AG 2017 Subject to change without prior notice PDF Reference FAV-134-2017-PD-PA BR 0717 / 4 En Produced in Germany

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