Interlocking 4.0: safe rail operations for increased capacity and reliability

Leading the way to greener and smarter mobility, worldwide.
Our ambition is to accompany all transportation stakeholders in meeting tomorrow’s mobility challenges. We strive to provide them with the most efficient and digital mobility systems, while further improving the environmental friendliness of our solutions.
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A comprehensive portfolio of mobility solutions
We offer a complete range of equipment and services, from high-speed trains, metros, trams and e-buses to integrated systems, customised services, infrastructure, signalling and digital mobility solutions.
Discover our solutionsState-of-the art and validated solutions
We offer extensive range of proven and modular components for all types of railway vehicles. Continuous research and development, combined with sound validation equipment and decades of return of experience on Alstom and non-Alstom trains, guarantee that our customers will receive both state-of-the art and validated solutions.
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We offer a complete range of sustainable solutions for tracklaying, electrification and the supply and installation of electromechanical material along the entire track, in stations and depots. These infrastructure solutions, whether they are for urban or mainline projects, facilitate the integration of products as part of turnkey solutions.
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Alstom draws on its technological expertise and innovative capabilities to meet the current and future needs of operators and passengers. Its solutions cover a whole range of services, including urban transit, mainline travel, regional transport, mining networks and freight.
Learn moreA custom support
We offer a complete range of customised services including maintenance, modernisation, parts & repairs and support. All of which ensure operators the highest level of availability for their fleets, infrastructure and signalling systems.
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Our state-of-the-art signaling solutions allow operators to ensure the highest standards in safe, seamless travel with urban and mainline solutions that meet the specific needs of each operation environment.
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Drawing on our complementary business lines, we offer bundled and fully integrated systems that include rolling stock, signaling, infrastructure and services. This turnkey approach optimises project execution and transport system performance.
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At Alstom, we value curious and innovative people who are passionate about working together to reinvent mobility, making it smarter and more sustainable. We are building an agile, inclusive, and responsible culture, where diverse people are offered opportunities to learn, grow and advance in their careers, with options across functions and geographies.
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Learn moreSmartlock range at a glance
With railway systems becoming ever more complex, railway operators and maintainers need an interlocking system that they can count on to guarantee the performance of the system. The Alstom interlocking family offers flexible, user-friendly and cost-effective solutions, contributing to a more robust railway system as well as increased availability for sustainable travel and freight transport options.
An interlocking system authorises train movement and ensures safety conditions are met. It operates points, signals and level crossings and checks rail sections are free, establishes routes and prevents conflicts.
In Alstom’s digital interlocking the technology transmits train control information digitally, via the IP network, providing enhanced coverage. Signals and points can be controlled at much greater distances, enabling capacity and processing speed, fewer cables and the possibility for data and digital analysis-driven maintenance.
With more than 3,000 installations in over 35 countries, Alstom’s interlocking range, Smartlock™ 400 and Ebi™ Lock 950 ensure integration with the most varied and complex infrastructures. These high-availability platforms are certified to Safety Integrity Level (SIL) 4, are redundant and require only minimum line possession during commissioning.
The principal and innovative feature of Alstom’s latest interlocking solution is the direct interfacing with trackside objects such as point machines and signals. This removes the need for intermediate relays, meaning that less ground infrastructure (20%) and cabling is required, generating a lower footprint, and consequently saving on maintenance costs.
While each installation is tailored to the customer’s specific needs, Alstom modular interlocking architecture, with standardised interfaces and maintenance and configuration tools, guarantees easy application to a host of different railway systems, whether new or existing, low density regional or high-speed mainline corridors, or to adapt to a future variation in network traffic. It can interface with existing trackside objects without modification, and it is compatible to signalling principles in any country. With this adaptability, project implementation times are much lower than other options available on the market.
Thanks to network-based architecture, Alstom interlocking makes for simplified interfaces with advanced train supervision and train control systems such as mainline ERTMS and urban CBTC. In addition to efficient maintenance systems that map out the status of objects along the line. When an anomaly occurs, an alert is sent to the nearest maintenance staff member indicating the part affected and the action required. All of this ensures faster troubleshooting and enhanced availability.