#Thales – Modern train control: the technology behind the first trans-Alpine base tunnel

This is an interesting case study by Thales on the first trans-Alpine base tunnel. It shows clearly and concisely how Thales’ solutions effectively met the challenges of the company responsible for the construction.

Switzerland’s hi-tech Lötschberg base tunnel is a powerful symbol of Europe’s rail revival. Opened in 2007, it provides fast, environmentally-friendly transport for people and goods through the heart of the continent, with Thales’ ETCS signalling solution playing a critical role in day-to-day operations.

The challenge
The Lötschberg project is a major tunnel construction through the Alps built by BLS AlpTransit AG (BLS-AT), a company especially established for this purpose.

Requirements specification for the train control system
The major requirement for the train signalling system was to provide free access to the LBL for all licensed railway undertakings through the implementation of the European Train Control System (ETCS) Level 2 and in compliance with the Technical Specifications for Interoperability (TSI). The tunnel operates as a part of the Rotterdam – Genova Corridor. To meet operational demands, the LBL project was extended to include the interlocking stations at the tunnel entrances in Frutigen and Visp.

The solution
The architecture comprises the standard ETCS Level 2 system as well as an intelligent line speed optimization with Automatic Functions (AF). Communication between the individual systems takes place via Synchronous Digital Hierarchy (SDH) technology.

Thales’ implementation plan for interoperable railway operation (ETCS Level 2)
Current UNISIG specifications leave room for interpretation with the result that interoperability has not yet been fully ensured. Due to this fact,
Thales launched an initiative entitled "IOP" (interoperability).

The aim of this initiative is to coordinate various suppliers of ETCS train-borne equipment (on board unit suppliers) with Thales as the trackside supplier for the Lötschberg Project. After performing a standardised set of lab and field tests, selected critical functions were discussed and a consensus on implementation was reached.

Thales’ recommendations were supported by the Federal Office of Transport (BAV). The BAV then appointed Schweizerische Bundesbahnen AG (SBB) "ETCS system leader". Furthermore, additional funds were allocated to BLS-AT and SBB to ensure efficient implementation of the measures recommended in the Thales IOP concept.

The result
Your benefit: signalling provider, system integrator and general contractor – all in one
The train control solution developed by Thales is highly innovative. It allows for efficient train control on the LBL under the specific conditions of a tunnel.
Thanks to its qualified project team, Thales was able to exchange information (regarding project development, risks and schedules) with stakeholders at all times during the entire duration of the project. Required action could therefore be determined at an early stage and necessary measures could be taken. This allowed an onschedule project implementation.
As Thales successfully coordinated all stakeholders and their involvement in the implementation of the LBL signalling systems, the client was able to concentrate on other technical matters.

Key benefits
• Interoperability
• Train speed optimisation
• Cab signalling ETCS Level 2
• Scalable architecture
• Complete integration by Thales
• Turn-key solution

Further information on the project can be downloaded on the Thales website. Click here to go to the page link.

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