Hitachi Rail completes first dynamic test of digital interlocking on Paris-Lyon line

Hitachi Rail completes first dynamic test of digital interlocking on Paris-Lyon line
© Hitachi Rail

Hitachi Rail has successfully completed the first dynamic test of its digital signalling technology for the Paris-Lyon High-Speed Line, with the project scheduled to enter service in autumn 2024.


The company is working with SNCF Reseau to modernise the Paris-Lyon high-speed line by replacing the current interlockings with its next-generation computerised interlocking systems, known as SEI+. The project is part of the Paris-Lyon LGV+ contract, which was awarded to Hitachi Rail in December 2019 for a total amount of €129.3 million.

The tests were carried out on a first section in the Paris area (Zone A) and confirmed that the interlocking system correctly allowed the test train, equipped with ERTMS digital signalling, to run with real commands from the Mistral remote control centre in Lyon (more than 500 km away). This new system uses the European standard for communication and interoperability between ground and train.

"This is the first time that Hitachi Rail's remit includes essential services such as on platform testing and on-site testing as part of the renovation project of a line operated by SNCF. We would therefore like to thank SNCF for its confidence and the close collaboration between our respective teams, which has enabled us to successfully complete this key milestone of the project", says Bernard Teyssieux, Project Manager at Hitachi Rail.

The complexity of the tests lies in the fact that the line is in operation and the tests can only be carried out at night. Hitachi Rail's on-site testers were mobilised to monitor the SEI+ substations being tested along the line and to help SNCF staff in the control room in Lyon to collect and analyse the results.

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