For over 125 years, WSB (Würzburger Straßenbahn GmbH) has been synonymous with mobility in the German city of Würzburg, which depends on a well developed and reliable local public transport system for its 130,000 residents. WSB transports 30 million passengers a year with its 120 trams and buses on 42 km of tramway lines and 196 km of bus routes.


Würzburger Straßenbahn GmbH

Market Segment


Project Time

2015 to 2016


DIB-R5 Compact


To ensure smooth and efficient operation, WSB needs reliable voice and data communication: for voice calls between the 430 employees in the tramway and bus service and for data transmission for the Intermodal Transport Control System (ITCS). The ICTS is responsible for all communication between the control room, trains and buses, making it the lifeline of all state-of-the-art transport companies.

Since 2008, WSB has been successively installing dynamic passenger information displays at the stopping places. WSB was the first local public transport company in Europe to use TETRA digital radio to transfer its data. The existing radio system ACCESSNET-T had been in use successfully since 2004. WSB decided to modernize its radio system in 2015, opting for future-proof IP technology and the TETRA radio system ACCESSNET-T IP from Hytera.

Our mobile radio solution in detail

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    The TETRA radio system offers all the functions required for reliable and efficient operation of a public transport company including fast call setup times, high voice quality and call functions like group calls. That means the employees in the vehicles can be reached by the control room at any time and they can also communicate among each other at all times. Calls can also be made to the public telephone network using the telephone gateway and a VoIP private automatic branch exchange. A voice recorder records all conversations.

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    The core function for transport companies is the ITCS. The system allows for satellite-supported geolocation (GPS) and display of the public transport vehicles in the control room. This supports efficient work processes by making it possible to respond promptly to any delays. Passengers benefit from the information on the dynamic passenger information boards, which is always up to date. The ITCS is also used to influence traffic signals and for counting passengers. WSB's application partner Trapeze was responsible for setting up the ITCS using the Hytera application interface.

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    ACCESSNET-T IP provides voice radio and data for all WSB trams and buses. The appropriate mobile radios are installed in the vehicles for this purpose and they are equipped with ITCS on-board computers. The on-board computers transfer the position data to the ITCS and the connected systems in real time. WSB traffic managers also use handheld radios so they can communicate outside of the vehicles as well.

    Hytera Mobilfunk replaced all the previous base stations at the five existing locations with high-performance DIB-R5 compact base stations that provide reliable radio coverage for tram and bus lines.

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    A high level of protection against failure is crucial in interlocking systems like these. Because of this, the base stations and switching nodes together with all software components such as the voice recorder and interfaces/gateways are designed redundantly. This increases protection against possible downtimes while ensuring continuous and reliable service.

    The comprehensive network management system (NMS) enables efficient management and reliable operation of the radio system:
    · Fault monitoring 
    · Subscriber management
    · Network configuration 
    · Performance monitoring

A smooth project

Würzburger Straßenbahnen (Würzburg tramway system) 

· The system transports 30 million passengers a year, roughly 20 million on the tramway system and 10 million with bus service

· 760 tramway connections every workday

· 430 employees in tramway and bus service

· 300 to 400 km covered every day by each tram

· 196 km of bus routes, 42 km of tram lines on a total of 5 lines

· 120 buses and trams in the vehicle fleet


About the Trapeze Group

Trapeze is a worldwide leading provider of comprehensive solutions for dispatching personnel and vehicles, operating control technology, passenger information and ticketing. More than 40 years of experience and approximately 2,500 customers worldwide make the Swiss company one of the leading providers in the industry.


Precisely what you need:

Solutions from Hytera Mobilfunk GmbH

Each of our mobile radio systems is a customized solution with optimal performance. No matter how difficult the conditions are. Or who the manufacturer of the terminals is. Customers in over 40 countries on four continents are already using our solutions in industry, the oil and gas sector, in energy supply, public security and local public transport systems, at airports and for military applications. In addition to the first-class technology from Hytera Mobilfunk GmbH, they value one thing above all else: With our end-to-end, customer-oriented project management we solve problems before they occur.

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