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Railway Communication Systems

The Swiss company COMLAB has been a specialist in high-frequency technology in the railway sector for 40 years, and develops, manufactures, sells and installs ready-to-use railway communication systems for tunnel and in-train use.

Due to its longstanding experience as a single point of contact, COMLAB is able to guarantee unique standards of quality and know-how in every process stage.

Innovative, reliable and durable, our systems represent a cost-effective, long-term investment for our customers. At the same time, our highly qualified engineers attribute the utmost importance to individual consultations, customer-specific solutions and support. Our key customers include international rail and train building companies, as well as mobile operators and emergency services organisations.

With branches in Germany and China and its global co-operation with a wide range of partners, COMLAB is able to respond effectively to the requirements of its customers all over the world.

Wireless Coverage for Railway Applications

COMLAB provides a comprehensive range of wireless coverage solutions. COMLAB’s repeater systems are suitable for various applications such as railway and metro line tunnels, road tunnels, buildings and in-train coverage. Thanks to many international contracts, we are one of the market leaders in the railway sector.

The system ensures that radio signals can be received inside their areas of use. Radio signals are not able to penetrate rock strata and certain strongly insulated areas, for instance. Therefore, the external antennas pick up the provider signals and the system amplifies and distributes them via leaky feeder cables or internal antennas.

Railway and Metro Tunnel Repeater System

Radio systems for railway tunnels are extremely complex. Whether it is the train staff, the emergency services personnel or the train passengers, everyone needs to be supplied with mobile communications. This means that multiple radio networks are required to operate alongside each other.

The COMLAB repeater system is a multi-operator and multi-band radio coverage system which is able to combine radio distress and safety systems (TETRA, TETRAPOL), global systems for mobile communications on railways (GSM-R) and public mobile telecommunications systems (GSM, UMTS, LTE) with one another, and to simultaneously protect them against mutual sources of interference.

Possible combinations of communications systems:

  • Radio distress and safety systems (TETRA / Tetrapol) for:-Police-Fire brigade-Emergency services-Armed forces and civil protection-National border forces
  • Global systems for mobile communications on railways (GSM-R) for:-Railway companies-Metro operators-Public authorities-Security services
  • Public mobile telecommunications systems (LTE / UMTS / GSM) for:-Railway companies-Metro operators-Mobile telecommunications operators

Your benefits with COMLAB railway and metro tunnel repeater solution:

  • Highly modular and expandable
  • Combination of different technologies in one communications system
  • High reliability thanks to a completely redundant system
  • High power efficiency
  • Complies with train driving and train control systems (e.g. ETCS or CTCS)
  • Data exchange in real time (even at speeds of more than 400km/h)
  • Web-based operation and maintenance control system (COSweb)
  • Remote control

Product Portfolio
Single band GSM-R repeater
Multi band repeater
Off-air, air-link and fiber optic repeater components
Radio cable systems (leaky feeder cables and antennas)

InTrain Repeater Solution

Train passengers and business travellers in particular expect excellent mobile reception. This includes the perfect voice quality, no dropped calls and easy data transmission.

The COMLAB InTrain repeater solution perfectly compensates for the high signal loss caused by modern train vehicles, which are very well-insulated with special thermally-insulated glass. It was specifically designed for extremely challenging use on high-speed trains.

With the operator-specific and automatic gain-trailing, the COMLAB repeater system manages the rapidly changing outdoor signal levels of the various networks, and ensures an even and strong level of reception within the train. Even while travelling from one country to another, it still provides gapless coverage.

Your benefits with COMLAB InTrain repeater solution:

  • Highly modular and expandable
  • Operator-specific automatic gain-trailing
  • Several technologies combined in one communications system
  • Integrated GPS for geo-switching and localization
  • Compact design
  • Cost efficient – one single COMLAB InTrain Repeater provides gapless coverage in up to four double-decker coaches
  • Complies with all the requirements of telecommunications equipment for railway application

Product Portfolio
Multi band repeater
Off-air repeater components
Radio cable systems (leaky feeder cable and antenna)

Radio Coverage for Railway Networks

The RUD-5 has been designed in order to extend radio coverage in various radio networks. Available as a fiber optical repeater or an off-air repeater, it is suited to numerous areas of use.

Features and benefits:

  • One product for various applications

-Multi-band and multiple operator system

-Up to five independent frequency bands

-Multiple operator and multiple technology support in each band

-Each band features up to 16 sub-bands and 16 providers

  • Maximum bandwidth

-Bandwidth ranging from 50 to 2700 MHz

-All technologies merged onto one platform

-Best available data throughput

  • Digital sub-band filtering

-Channel or band selective

-No interferences, only desired signals amplified

-Operator specific automatic gain trailing and control

  • High degree of customisation

-Highly modular and expandable

-Flexible system upgrade

-Easy module exchange

  • Future orientated

-Easy operator specific re-farming of frequency bands

  • Smallest housing on market


-Single band housing

-Three band housing

-Five band housing

Indoor / InTrain:

-19’’ Rack (RUD19-5)

  • Options for safety, commercial or mixed applications

-High or medium power class

-Redundant Power Supply Module (PSM)

-Redundant Fiber Optic Module (FOM)

-Automatic gain-trailing and control

-Echo cancellation

-Isolation measurement (Automatic measurement)

-Oscillation detection

-Spectrum scan

-PIM detection

-Frequency Shift

-External alarm

-Polygon-based settings

-Web-based operation and maintenance system (COSweb)

-Integrated GPS for geo-switching and localization

-Mass software upgrades

Supported Technologies

  • GSM
  • UMTS
  • LTE
  • GSM-R
  • TETRA / Tetrapol
  • AM
  • FM break-in
  • DAB+ break-in
  • UHF
  • VHF
Read more


very high-speed train

Very High-Speed Train at Shanghai Lujiazui Fnancial Center

Comlab Systems

Comlab Systems

COMLAB Railway Communication Systems

COMLAB Railway Communication Systems

InTrain graphic

Comlab InTrain Repeater

Comlab In Train Communications

InTrain Mobile Communications


Comlab Repeater

Comlab Building

Company Building


© Deutsche Bahn AG

COMLAB AG Documents




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