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voestalpine Signaling Siershahn GmbH

Founded as SST Signal & System Technik in Germany in 1997, voestalpine Signaling Siershahn is a specialist in railway diagnostic and monitoring technologies. Our innovative checkpoint solution allows smart rolling stock monitoring, customized to individual requirements. Based on an interconnected structure of PHOENIX hardware and software we have developed a world leading monitoring suite for intelligent maintenance.

With branch offices in the Netherlands and Australia we are a reliable partner for customers all over the world. Our customers include a variety of users: train operating companies, freight operating companies, metro operators, rolling stock maintainers, mining companies, rail infrastructure managers and maintainers.

Almost 3,000 installed sensors of our wide product portfolio ensure safety and performance on track – worldwide.

  • 1997: Formation of "SST Signal & System Technik GmbH" and start of the development of the hot box detection system PHOENIX MB.

    2001: First installation of a PHOENIX MB system in Germany and first supplies to Deutsche Bahn
    Installation on the High Speed Line Madrid – Sevilla.

    2002: Enhancement of the product portfolio with the wheel impact load detection sensor ATLAS.

    2003: First installation of a PHOENIX MB system in Australia.

    2004: Start of the development of the software CMS (Central Monitoring System).

    2005: SST joins the voestalpine Group.

    2008: First installation of an ATLAS system in Litauen.

    2009 – 2010: Installation of 46 MISTRAL systems for wind and airstream measurement on the High Speed Line Munich - Kassel.

    2011: Expansion: A new office in Sydney opens and "Baas R&D" in Waddinxveen is integrated as Dutch branch office.

    2014: SST is renamed "voestalpine SIGNALING Siershahn GmbH" and now fully integrated in the voestalpine Group.

    2016: Official product launch of the modular Checkpoint solution with interconnected PHOENIX software and hardware at InnoTrans. First installations of the new hot box detection generation PHOENIXMDS HBD.

    Since 2016: Update of the central software in the operations control centers of Deutsche Bahn and integration of approx. 3000 devices along the trackside.

    2017: Acquisition of DataTraks, USA as wholly-owned subsidiary voestalpine SIGNALING USA – now the competence center for the development of acoustic monitoring. First installation of a PHOENIXMDS Checkpoint with profile validation system, derailment detection, dragging equipment detection and wheel impact load detection in Austria – until 2023 up to 40 locations in Austria will be equipped with modular sensor technologies.

    2016 – 2017: Installation of three out of ten acoustic measurement systems on High Speed Lines in Germany to monitor the ICE fleet’s bearings.

    2018: First-time use of fiber optic cables for the transfer of the acquired data to cover a larger distance between sensors and cabinet.


Managing Director - CEO
Business Development / Customer Service / Research & Development / Engineering / Human Resources / Subsidiary the Netherlands


Managing Director - CSO
Sales & Marketing / Subsidiary Australia

Gerald KNAPP

Managing Director - CFO
Finance & Controlling / IT

Steve-Patrick STAHL

Managing Director - COO
Supply Chain Managment / QHSEE

Luuk van de BELD

Senior Vice President - Branch Office Netherlands

Daniel CRISP

Senior Vice President - Branch Office Australia


  • Thanks to a wide range of options and variants and compliance to interoperability, PHOENIX MDS is suitable for the use in various conditions, including snowy winters and hot and dusty environments like deserts.

    Learn more about Mixed Traffic at voestalpine Railway Systems.

  • The modular design perfectly fits the needs of a variety of customer requirements in the metro segment. Especially fast installation, long intervals between maintenance operations and short working time in the track are key features of PHOENIX MDS.

    Learn more about Urban Traffic for Metros at voestalpine Railway Systems.

  • Flexible sensor arrangements fulfill a wide range of customer requirements. Additionally, less maintenance work thanks to applied condition-based maintenance algorithms reduces the track downtime and increases customer’s value.

    Learn more about Urban Traffic for Trams at voestalpine Railway Systems.

  • Heavy haul freight trains demand special requirements to the infrastructure including enhanced resistance to mechanical stress. PHOENIX MDS proves that every day by measuring various freight trains in North America and Australia.

    Learn more about Freight Traffic at voestalpine Railway Systems.

  • PHOENIX MDS is equipped with a high speed data acquisition system, enabling reliable measurements even on high-speed tracks and enhancing security of passenger trains traveling at speeds up to 500km/h.

    Learn more about High Speed Traffic at voestalpine Railway Systems.

Products & Services

  • myPHOENIX: voestalpine Signaling Siershahn GmbH created through the service portal "myPHOENIX" the possibility for customers to gain secured access to their personalized area including documentation and repair messages.

    Academy: The PHOENIX ACADEMY is your competent partner for knowledge transfer and extensive professional development.

    Life Cycle Management: In order to keep a high quality level and to let innovation grow, it is necessary to replace outdated parts or products by more efficient components. Learn more about Life Cycle Management.

Terms & Conditions, Facts