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Projects  /  Tehran-Mashhad Railway  
Project: Telecommunication & SCADA systems of Tehran-Mashhad Railway
Location: Along Tehran Mashhad Railway Route
Client: Iranian Railways Company, RAJA Contract
Type: Detail Engineering, Procurement, Construction and Commissioning
Started: 2010
Planned Duration: 30 Months
Status: Contract Phase

Project Summary

Tehran Mashhad Railway is one of the main railway routes in Iran. With more than 50 train stations along the way, it has a total length of about 800 km, and has recently gone under major revamping. The "Electrification project" has been defined to provide the required electrical energy for the power lines which feed the trains. There are 97 power stations along side the railway.

The scope of work of Pars Saman includes implementation of Telecommunication, Control & SCADA systems for this railway and its stations.

This network will provide RAI (Islamic Republic of Iran Railways) with a robust, reliable and fast supervisory and control network, and can also provide interface to other necessary telecommunication equipments such as PABX for delivery of voice services in the power stations. The SCADA portion of the project includes creating redundant hot standby central supervisory and control centers for all of the power stations.


Scope of work

The contract for the "Electrification of Tehran-Mashhad railway"project is a full EPC project and has been recently awarded a consortium consisting of Hirbodan, Pars Wagon, TAM Iran Khodro, Pars Saman & Barsan. Pars Saman is responsible for Telecommunication and SCADA systems of this project, and is currently in the process of detail engineering of the project.

The project includes 4 major sub-systems
  • PLC/RTUs and interfacing mechanisms with the control panels for data gathering.
    This is the state of the art part of the project. The control panels are based on edge of technology PLCs. In a sensitive task, The RTUs of SCADA project are supposed to interface with specific signals on the panels and transmit them to the control center.
  • NG-SDH systems for data transmission.
    The backbone of the network is a wide-spread NG-SDH network, and it uses existing fiber optic cables buried along side the route and new ADSS fiber optic cables which will be installed on the power poles. Each power station is equipped with an NG-SDH transmission equipment which receives input signals from the RTU and transmits it to its corresponding gathering center over optical fiber. The NG-SDH system is also capable of providing interfaces for voice and video applications. The bandwidth of the network between the power stations and control centers is 622 Mbps (STM-4) upgradeable to STM-16.
  • ADSS Fiber Optic Cable.
    Aerial Self-Support cable is provided for the next phase of the project to physically connect the power posts to the control center. The cable has 6 optical cores and is installed on top of the power lines or traction poles. It has been suggested to use ADSS for the first phase instead of using existing buried fiber optic media. The usage of this specific type of fiber optic cable which has been acknowledged by the end user as a valuable and outstanding optional proposal will cut the project prices and execution time.
  • SCADA & RTU System:
    The SCADA system shall monitor and control 97 un-manned Power Stations along side the route and will be controlled from primary OCCs in Shahrud and Tehran and a second level control center in Mashhad. The system design shall meet the functional requirements for a reliable secure SCADA system. Due to the strategic role of this high traffic rail route and the extensive importance of safe operation of the trains and locomotives in this very high speed line, the SCADA system which is the main controller of the whole line shall meet latest design practices and standards in the transportation industry. The system design will be based on the aim to:
    - Achieve a high system availability with minimum downtime and cost for maintenance and repair
    - Exchange data with existing local control systems
    - Avoid losses and damages
    - Allow changes and extension of the system
    - Provide a safe, environment friendly, efficient and economic operation of the facilities

    This is achieved by the following means:
    - Redundancy of the SCADA System
    - Reliability with fast communication system (Ethernet TCP/IP)
    - Market admired Viewstar ICS SCADA software
    - Usage of well proven SCADA workstation hardware from reputable suppliers
  • Control Center Equipment:
    The SCADA portion includes implementation of a central supervisory and control center for all of electrification power stations and traffic from all stations will be routed to this center. The control center consists of a redundant LAN which interconnects 2 SCADA servers, 2 SCADA operator consoles, 1 SCADA Engineering console and 1 Network Management Console. All servers and PCs are of industrial type. The HMI software installed on servers and consoles enables the engineers and operators to monitor near 25000 tags which is more than sufficient for the application. Furthermore the control center will be used as Management Center for NG-SDH network and will be equipped with necessary hardware and software. Also Primary Resource Clock (PRC) for NG-SDH will be installed in these centers.

Scope of Supply

RTU/PLC, Modicon M340 Schneider Electrics (Germany)
SCADA Software, Viewstar ICS Suite Cegelec (Germany)
ADSS Fiber Optic Cable Ericsson (Sweden)
NG-SDH Add & Drop Multiplexers Ericsson (Sweden)
Ethernet Data Switch well known international companies
Industrial Servers and PCs Fujitsu Siemens (Germany)
PRC and SSU for Optical Network Synch. Symmetricom (Germany)
GPS Master Clock  Meinberg (Germany)



Main Features

  • The very first Railway Electrification project in Iran.
  • Critical importance of the operation of the railway with minimum shut-down time
  • Implementation of a secure and robust network for future voice and data applications, including video conferencing, CCTV, VoIP, etc.
  • Vast geographical area of the project execution site
  • Different control and monitoring requirements