Hitachi Rail STS
A Hitachi Rail company that develops railway signalling, train-control, traffic-management and integrated transportation systems.
Last updated August 26, 2026
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Overview
Hitachi Rail STS is the signalling and transportation-systems business formerly known as Ansaldo STS. The Italian company designs, engineers, manufactures, installs, integrates and maintains systems used to control railway, metro, mass-transit and freight operations. Its scope extends from individual safety-critical components and interlocking equipment to complete signalling architectures, automatic train-control systems, communications-based train control, traffic-management platforms and associated supervision and maintenance services. The company traces its industrial heritage to several long-running railway engineering businesses. Its lineage includes Gio. Ansaldo & C., founded in Genoa in 1853, and signalling specialists such as Union Switch & Signal in the United States and Compagnie des Signaux pour Chemins de fer in France. Ansaldo’s transportation activities were reorganized during the late twentieth and early twenty-first centuries as the Finmeccanica group separated rolling-stock, signalling and transport-infrastructure activities. Ansaldo Trasporti Sistemi Ferroviari and Ansaldo Signal were combined in 2006 to form Ansaldo STS, which was partially floated on the Milan stock exchange. Hitachi entered the company through its acquisition of Finmeccanica’s transportation businesses. In 2015, Hitachi acquired Finmeccanica’s controlling stake in Ansaldo STS and subsequently increased its ownership through a tender offer and additional share purchases. Hitachi completed the acquisition of the remaining publicly held interests after agreeing in 2018 to acquire Elliott Management’s stake. Ansaldo STS was delisted from Borsa Italiana and renamed Hitachi Rail STS on 30 January 2019. Its activities are generally organized around passenger railway and mass-transit systems on one side and main-line and freight railway systems on the other. Passenger and urban-transit capabilities include communications-based train control, driverless automatic train control, interlocking, supervisory control and data acquisition, depot and platform systems, and traffic-management technologies. The company has supplied or supported systems for metros and urban railways in cities including Copenhagen, Rome, Milan, Brescia, Naples, Paris, Los Angeles, Hong Kong, Shenyang, Thessaloniki, Riyadh, Taipei and Honolulu. In main-line rail, Hitachi Rail STS has worked on high-speed and conventional railway signalling, including European Train Control System and European Rail Traffic Management System deployments. Its predecessor companies commissioned the first high-speed TVM signalling system on France’s Paris–Lyon LGV in 1981 and later supplied the signalling system for the first high-speed line operating with ERTMS Level 2, between Rome and Naples, in 2005. Its freight portfolio includes dispatching, train-control, wayside equipment, level-crossing systems and autonomous or highly automated train-management technologies. In Australia, the business contributed to AutoHaul-related technology for automated heavy-haul rail operations. The company’s component and platform portfolio includes MicroLok II interlocking, track circuits, switch machines, conventional and LED signals, Eurobalises, vital relays, hot-wheel detectors and highway-crossing mechanisms. Its Optimizing Traffic Planner evolved from computer-aided dispatching systems developed for North American railroads and is intended to optimize timetables, routing, capacity and train movements under changing operating conditions. Hitachi Rail STS operates as part of Hitachi Rail rather than as a separately listed public company. In 2024, Hitachi Rail and MERMEC signed a put-option agreement concerning the proposed sale of Hitachi Rail’s main-line signalling business in France and signalling business units in Germany and the United Kingdom. The transaction related to the wider Hitachi Rail portfolio and may affect the scope of activities associated with the STS business.
History
Hitachi Rail STS was created from the consolidation of two Finmeccanica transportation businesses: Ansaldo Trasporti Sistemi Ferroviari and Ansaldo Signal. The combination was completed in 2006 under the Ansaldo STS name and was followed by a partial initial public offering on the Milan stock exchange. The company inherited a broad industrial history rather than a single newly created technology platform. One important predecessor was Gio. Ansaldo & C., founded in Genoa in 1853 by Giovanni Ansaldo. The business initially manufactured steam locomotives and later expanded into shipbuilding, electrical engineering and nuclear-energy activities. Another lineage came from Union Switch & Signal, founded in Pittsburgh in 1881 from signalling-related assets associated with George Westinghouse and William Robinson. Ansaldo acquired Union Switch & Signal in 1988; it later became Ansaldo STS USA. In France, Ansaldo acquired Compagnie des Signaux pour Chemins de fer in 1996, adding a signalling organization with origins in the early Paris Metro era. Finmeccanica reorganized Ansaldo's transportation activities during the 1990s and early 2000s. In 2001, the transportation business was separated into rolling stock, railway signalling and broader transport-systems activities. The signalling operation became associated with Ansaldo Signal, while the transport-systems activities were organized through Ansaldo Trasporti Sistemi Ferroviari. Their 2006 merger created Ansaldo STS, with Finmeccanica retaining a substantial stake and public investors holding the balance. Hitachi's ownership began in February 2015, when it acquired Finmeccanica's 51 percent interest and initiated a tender offer for the outstanding shares. During the same year, Hitachi Rail Italy Investment acquired an additional 40 percent of the share capital. Stefano Siragusa was confirmed as chief executive officer and general manager under the new ownership. He resigned in March 2016 and remained in office until the appointment of a new board. In May 2016, Andrew Barr was appointed chief executive officer and general manager. In October 2018, Hitachi agreed to purchase Elliott Management's remaining 32 percent stake and then pursued the remaining publicly held shares. Hitachi announced in January 2019 that it held approximately 99 percent of Ansaldo STS. The company was formally delisted from Borsa Italiana on 30 January 2019 and renamed Hitachi Rail STS. The business has supplied technology for major rail and metro projects across Europe, North America, Asia, Australia and the Middle East. Its historical high-speed achievements include the first TVM high-speed signalling system on France's Paris–Lyon LGV in 1981 and the first high-speed ERTMS Level 2 line, between Rome and Naples, in 2005. The company has also delivered driverless automatic train-control technology for Copenhagen Metro and subsequently supported driverless or automated metro projects in several international cities. Its North American heritage includes computer-aided dispatching work developed for freight railroads, while later systems such as Optimizing Traffic Planner address timetable creation, capacity management and real-time operational replanning. In Australia, the business developed technology associated with automated heavy-haul operations, including AutoHaul-related train-management and signalling capabilities. Since becoming part of Hitachi Rail, the organization has operated as a wholly owned railway technology business rather than a separately listed company. A 2024 put-option agreement between Hitachi Rail and MERMEC concerned the possible transfer of selected main-line signalling activities in France, Germany and the United Kingdom. The agreement illustrates the continuing portfolio restructuring of Hitachi Rail's signalling activities.
- 2024
Put-option agreement with MERMEC
[1]Hitachi Rail signed an agreement concerning the possible sale of selected main-line signalling activities in France, Germany and the United Kingdom.
- 2019
The company became Hitachi Rail STS
[1]After reaching approximately 99 percent ownership, Hitachi delisted Ansaldo STS and renamed it Hitachi Rail STS.
- 2015
Hitachi acquired a controlling interest
[1]Hitachi purchased Finmeccanica's controlling stake and began the process of taking full ownership of Ansaldo STS.
- 2006
Ansaldo STS was formed and partially floated
[1]Ansaldo Signal and Ansaldo Trasporti Sistemi Ferroviari were merged, and the resulting company began trading on Borsa Italiana.
- 2005
ERTMS Level 2 high-speed milestone
[1]The Rome–Naples high-speed line became the first high-speed line operating with ERTMS Level 2 signalling.
- 1996
Acquisition of CSE
[1]Ansaldo expanded its European signalling operations by acquiring the French Compagnie des Signaux pour Chemins de fer.
- 1981
First TVM high-speed signalling system
[1]A predecessor company commissioned TVM signalling for the first French high-speed line between Paris and Lyon.
- 1881
Union Switch & Signal was established
[1]The Pittsburgh signalling company became a major predecessor of the North American operations later associated with Ansaldo STS and Hitachi Rail STS.
- 1853
Gio. Ansaldo & C. was founded
[1]Giovanni Ansaldo founded the industrial company in Genoa, establishing an important predecessor lineage for the later Ansaldo transportation businesses.
Products and positioning
A global railway technology and systems-integration specialist focused on safety-critical signalling, train control, traffic management, automation and turnkey transportation infrastructure.
Railway interlocking
MicroLok II
A vital railway interlocking platform used to control routes and enforce safety conditions in railway and transit applications. It forms part of the company's wayside signalling portfolio and can be integrated with other train-control and traffic-management systems.
Traffic management and dispatching
Optimizing Traffic Planner
A planning and optimization platform descended from computer-aided dispatching work developed for North American railroads. It can support timetable construction and real-time operational replanning by considering train movements, infrastructure constraints, operating rules and changing network conditions.
Urban rail train control
Communications-Based Train Control
A radio-based train-control architecture that exchanges information between onboard equipment, wayside controllers, interlockings and control zones. It is designed to improve movement-authority enforcement, headways, capacity and operational monitoring on metro and mass-transit systems.
Automatic train operation and control · 2002
Driverless Automatic Train Control
Automatic train-control technology for driverless metro operations. The company supplied systems certified under European CENELEC safety standards for Copenhagen Metro and later delivered or supported comparable solutions for urban rail projects in Europe, Asia and the Middle East.
Main-line and high-speed signalling
ERTMS and ETCS signalling
European interoperability solutions covering train protection, onboard and wayside equipment, communications and movement-authority functions. Hitachi Rail STS and its predecessors have participated in Level 1 and Level 2 deployments on conventional and high-speed railway corridors.
Freight railway technology
Freight railway automation systems
A set of signalling, train-management, dispatching and communications technologies for heavy-haul and freight networks. The portfolio includes support for automated operations, wayside detection, routing and control, including technology associated with Australia's AutoHaul program.
Brand decisions
2024
Agreement concerning selected signalling businessesM&ABackground
Hitachi Rail reviewed parts of its main-line signalling portfolio as part of wider business and asset management.
Action taken
Hitachi Rail and MERMEC signed a put-option agreement covering Hitachi Rail's main-line signalling business in France and signalling units in Germany and the United Kingdom.
Aftermath
The agreement indicated a possible transfer of selected European signalling activities; the reference material does not establish a completed transaction.
2019
Rebranding and delisting as Hitachi Rail STSStrategyBackground
Hitachi had accumulated approximately 99 percent of Ansaldo STS after purchasing Elliott Management's stake and acquiring additional publicly held shares.
Action taken
The company was delisted from Borsa Italiana and renamed Hitachi Rail STS.
Aftermath
The business continued as a wholly owned Hitachi Rail company rather than as a separately listed entity.
2015
Hitachi began acquiring Ansaldo STSM&ABackground
Finmeccanica sought to transfer ownership of its transportation businesses as Hitachi expanded its railway portfolio and pursued a broader combination of rolling-stock and signalling capabilities.
Action taken
Hitachi acquired Finmeccanica's 51 percent holding and launched a tender offer for the remaining shares, later acquiring further equity.
Aftermath
Ansaldo STS became part of the Hitachi Rail group, with Hitachi moving toward full ownership and integration.
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