Three test trains, one per rail operator (SNCF, DBN Netz and SBB/Siemens), are used to collect real data. Above is an SBB train in the Lavaux-Oron district, Switzerland. (Photo: RomanBabakin/iStock/Getty Images Plus/Getty Images)
The European Railway Traffic Management System (ERTMS) could start using Europe’s space solutions to manage rail traffic.
A project funded by the European Union Space Program Agency (EUSPA) is taking steps toward providing a cost-efficient train-tracking solution based on satellite technology, together with other sensors and data.
Knowing the exact position of each train is at the heart of rail operations across the European Union (EU). ERTMS is a major industrial EU project to create a more efficient and safer interoperable railway system. It currently relies on a series of costly ground instruments. In the coming years, ERTMS could switch to EU space solutions.
In a project dubbed CLUG — short for Certifiable Localization Unit with GNSS — experienced rail operators and infrastructure managers came together to define a set of specifications and operational scenarios that meet the most stringent safety needs of the rail sector. The specifications are used by the architects of the CLUG consortium, who are in the process of rolling out the system.
The project’s goal is to assess the creation of a failsafe train localization onboard unit (TLOBU) interoperable across the entire European railway network. The TLOBU will provide trains and railway operators with critical information such as positioning and velocity, complemented by acceleration, heading and attitude for applications.
The French national rail company SNCF is adopting Galileo technology to boost customer services, in particular in its high-speed TGV network. TGV is France’s intercity high-speed rail service, and is operated by the SNCF.
With almost 50% of TGV trains already equipped with Galileo receivers, European GNSS is enabling improved customer information and traffic management.
Galileo is a technology building block that can precisely and safely locate trains and contribute to the future evolution of the European Rail Traffic Management System (ERTMS). ERTMS aims to harmonize signaling systems across Europe, and European GNSS can help reduce its costs.
SNCF is already embracing GNSS-based systems, in particular for passenger information, and fleet and traffic management.
“At the beginning of 2019, some 250 high-speed trains were already equipped with Galileo-ready receivers,” said Antoine Barre, head of SNCF train localization projects. “This represents nearly 50% of SNCF’s TGV fleet. Some 320 trains are expected to be Galileo-ready by the end of 2019.”
70 million passengers to benefit
The aim is to deliver Galileo-enabled services along the entire train journey and customer experience. During 2019, more than 70 million passengers will benefit from the improved accuracy and positioning availability delivered to French TGV trains by Galileo.
SNCF aims to equip its entire train fleet with Galileo receivers to assist non-safety relevant train localization. It also plans to further investigate the future contribution of European GNSS within ERTMS.
“Having Galileo on the iconic TGV trains is a major milestone for us, confirming that European GNSS is delivering a clear value added to one of the main EU Railway undertakings,” said Daniel Lopour, GSA market development officer.
“It is also good to see that SNCF is further progressing towards GNSS adoption on the regional fleet on the basis of the GSA position paper delivered earlier to the Community of European Railways (CER), explaining the benefits of Galileo for such applications,” Louper said.
Currently, signaling is enabled by equipment installed along rail tracks that requires regular inspection and maintenance. Accurate and reliable geolocation using GNSS will enable rail networks to reduce the cost related to the infrastructure.
Receivers installed in the train and connected via wireless networks should considerably reduce the costs of operation, maintenance and renewal of the network.
SNCF has identified three main themes of work for future rail technologies: geolocation, telecommunication and the use of satellite images for infrastructure monitoring.
Technology forward
Speaking at the Space for Innovation in Rail event, held in Vienna, Austria, March 18-19, Corinne Talotte described SNCF’s Technology Forward programme. Talotte is director of Innovative Technologies at SNCF. Talotte explain that the SNCF program is looking to build the “Railway for the Future” — a railway that is “autonomous, connected and zero emission.”
This spirit of innovation at SNCF aims to accelerate the implementation of new technologies. “First, this involves keeping an open mind on innovation and learning from other transport sectors,” Talotte said. “And our second important principle is to move to demonstrate innovative technologies as soon as possible in real operational situations to prepare the future deployment of innovations.”
Highly precise geolocation is a key element to enable autonomy in all modes of transport and future mobility systems. For trains, autonomous operation can increase the density of trains operating in the network while at the same time improving safety and reliability of customer services.
Space4Rail: From innovation to implementation
“We need to know accurately the position, velocity and attitude in real time to enable autonomous train systems,” explained Talotte. “We are developing a multi-sensor system for localisation based on GNSS but combined with other inertial sensors.
“This hybrid approach is inspired by the approach already adopted in the aviation sector. SNCF is undertaking a number of demonstrations with several partners, including the ERTMS user group and the Shift2Rail Joint Undertaking.”
Hybrid architecture
At the Space for Innovation in Rail event, Corinne Talotte said that SNCF was working on the remote operation of trains for use cases like shunting yards and the development of fully autonomous train prototypes.
The hybrid architecture makes it possible to take advantage of the benefits offered by both technologies: GNSS corrects the natural drift of the inertial unit, and when GNSS is not available, for example in tunnels or in dense urban environments, the inertial unit can take over to ensure continuity of location data. The inertial unit also protects the system from any possible disturbances in the GNSS signal, such as jamming or spoofing, as well as environmental factors.
The use of autonomous trains with innovative network control systems should enable SNCF to increase throughput on its lines. The objective is to carry more people and more goods, with greater regularity, improved energy efficiency and better economic performance, while ensuring continuing high levels of safety.
SNCF believes that the autonomous train is no longer science fiction, but the immediate future. A first prototype remote-controlled freight train should be tested some time this year, and the first prototypes of freight and passenger trains with autonomous driving capability are predicted beginning in 2023, with gradual implementation.
As European satellites offer a possibility to improve the efficiency of train control systems, GNSS technology is starting to gain momentum in the rail sector. To promote the role of GNSS in this important sector, the European GNSS Agency (GSA) recently exhibited at Innotrans — a leading rail transport tradeshow.
EGNOS can and, in the future, Galileo will provide continuous and highly reliable positioning service — helping increase the competitiveness of rail among other modes of transportation. Currently, GNSS in European rail is primarily used within non-safety-of-life applications, including asset management and passenger information services. However, the latest technological developments show that augmented GNSS, together with specific sensors, can help satisfy the stringent CENELEC Safety and Integrity Level requirements.
As a result, the rail sector has an increasing demand for cost-effective and innovative GNSS applications for both safety critical and non-safety critical purpose. For example, in the safety-critical domain, GNSS-based applications can provide signaling and autonomous train control. In the non-safety critical domain, GNSS is helping improve the performance of asset management and passenger information systems.
Showcasing the E-GNSS Advantage
With rail becoming an important market segment for GNSS technology, and to put emphasis on the many benefits E-GNSS can bring the rail sector, for the first time the GSA exhibited at a rail tradeshow. At Innotrans, one of the leading international tradeshows for the sector held September 23-26 in Berlin, the GSA showcased the EGNOS advantage for rail.
Joining a panel discussion hosted by the European Railways Agency (ERA) entitled “How Heaven Could Support European Train Control System (ETCS),” GSA Head of Market Development Gian-Gherardo Calini explained how European GNSS can serve as a solution to some of the problems the sector currently faces.
“Although rail will become a major market for E-GNSS, it is already providing benefits, such as helping to improve safety,” he said. “Our role at the GSA is to serve the end user by making sure the technology delivers the necessary solutions.”
Calini acknowledged there are challenges to the sector’s full adoption of GNSS, but stated that other sectors have overcome challenges and are benefiting from E-GNSS: “It is a successful reality in other transport sectors, especially aviation, and we must focus on building from these experiences,” he said.
The ERTMS/ETCS is a major industrial project that aims to replace Europe’s different national train control and command systems. The deployment of ERTMS will enable the creation of a seamless European railway system with aligned signalling — essential to increasing the competitiveness of European railways.
Europe’s GNSS systems — Galileo and EGNOS — are actively contributing to the needed evolution of the ERTMS. One example of this long-term perspective is the Shift2Rail Joint Undertaking, whose objective is also to support the adoption of GNSS in the rail sector. Within this undertaking, it is foreseen that both Galileo and EGNOS will be brought into ERTMS standards and foster European GNSS adoption in the area of Low Density Lines.
