GTR, Siemens: ETCS Digital Signalling Upgrade on Class 717 Trains

GTR and Siemens Mobility Launch Digital Signalling Upgrade on Class 717 Fleet

In a significant leap forward for rail technology, Govia Thameslink Railway (GTR), in partnership with Siemens Mobility, has successfully deployed an advanced version of the European Train Control System (ETCS) on its Class 717 Great Northern trains. This upgrade, utilizing ETCS Baseline 3, Release 2 (version 3.6.0), marks a crucial step in the East Coast Digital Programme (ECDP) and promises to enhance capacity and reliability on the East Coast Main Line (ECML). The first passenger service utilizing the upgraded ETCS ran on July 8th, 2025, on the Northern City Line (NCL). This initiative, a core component of the government-funded ECDP, aims to introduce digital signalling to an intercity mainline for the first time in Great Britain. The shift to digital signalling, facilitated by ETCS, promises to streamline operations, reduce reliance on lineside infrastructure, and pave the way for a more responsive and punctual rail network. This article will delve into the technological advancements, operational benefits, and the broader implications of this significant project.

Digital Signalling: A Technological Overview

The core of this upgrade is the implementation of ETCS, a sophisticated in-cab signalling system. This iteration of ETCS, Baseline 3, Release 2 (often referred to as version 3.6.0), introduces significant improvements over previous versions. A key enhancement is the adoption of packet-switched communication via General Packet Radio Service (GPRS). This replaces the older, circuit-switched GSM-R network, which suffered from capacity limitations. GPRS allows for more efficient data transmission, crucial for managing the high volume of services on the ECML. This advanced system provides drivers with real-time information directly within their cabs, effectively replacing much of the traditional lineside signalling equipment. This transition not only streamlines operations but also reduces maintenance requirements, leading to significant long-term cost savings and improved network resilience. The project’s success hinges on the seamless integration of this technology across the entire Class 717 fleet and, eventually, all operators along the ECML.

Operational Benefits and Capacity Enhancements

The adoption of ETCS brings a wealth of operational advantages. With the elimination of extensive lineside signalling equipment, engineering work related to signalling is projected to be cut by almost half. The continuous communication between trackside systems and onboard units enhances network responsiveness, contributing to a more punctual and reliable service. This upgrade is particularly critical on the ECML, one of the busiest rail routes in the UK. The increased data capacity offered by GPRS-based ETCS will allow for a greater number of trains to operate on the line, effectively boosting overall capacity. Early indications from the NCL, where ETCS is already operational, point to fewer disruptions, reduced maintenance, and smoother journeys for passengers. The digital signalling system ensures that drivers receive the most accurate and timely information, leading to improved safety and more efficient train management.

The East Coast Digital Programme: A Broader Perspective

The implementation of ETCS on the Class 717 fleet is a cornerstone of the ECDP, a far-reaching initiative aimed at modernizing the ECML. Funded by the government, the ECDP seeks to introduce digital signalling across the entire intercity mainline, representing a first for Great Britain. Network Rail’s ECDP integration lead, Jonathan Daniels, emphasizes the critical role this new ETCS baseline plays in the broader scheme, noting that the success of the Class 717 upgrade will be pivotal in its adoption by other fleets operating on the ECML. The ECDP also aligns with the broader industry goals of decarbonization. The transition to digital signalling, alongside other infrastructure upgrades, is projected to cut carbon emissions, specifically the ECML’s electrification, by approximately 55,000 tonnes over 60 years. This combination promotes energy-efficient journeys and could encourage a shift from road and air travel to rail.

Siemens Mobility’s Role and Future Developments

Siemens Mobility, as the technology provider for the Class 717 trains, plays a crucial role in this transformation. Ben Lane, Siemens Mobility’s infrastructure lead and ECDP project director, highlights the benefits already evident on the NCL, and the company’s commitment to the successful rollout across the ECML. The company’s expertise in digital signalling is vital to the project’s success. Furthermore, Alstom has also shown a commitment to GTR by expanding its technical support and spares supply agreement earlier in February with a £24.5m ($30.3m) variation contract. This commitment includes the reactivation of an additional 30 Class 379 trains. This ongoing investment in infrastructure and maintenance will ensure continued operational efficiency and performance. All 25 Class 717 trains are scheduled to receive the ETCS software upgrade in the coming months, ensuring all operators along the East Coast Mainline transition to the new baseline.

Conclusion

The successful deployment of ETCS Baseline 3, Release 2 on GTR’s Class 717 fleet, marks a watershed moment in the UK rail industry. This technological advancement, driven by the ECDP and supported by Siemens Mobility, signals a shift toward a more efficient, reliable, and sustainable railway network. The move from circuit-switched GSM-R to packet-switched GPRS communication offers a significant increase in capacity, promising to alleviate congestion on the ECML. The expected reduction in maintenance requirements and enhanced network responsiveness will lead to improved punctuality and a more seamless passenger experience. This project’s success sets a precedent for digital signalling adoption across other major rail routes in the UK. The move also aligns with the broader industry objectives of decarbonization, paving the way for a more environmentally friendly future for rail travel. The ongoing commitment from both public and private entities highlights the critical importance of technological innovation in modernising rail infrastructure. The coming months will be crucial in assessing the impact of the system’s full deployment, and the lessons learned from this initial phase are certain to shape the future of digital signalling in the UK rail industry.

Company Summary

Govia Thameslink Railway (GTR): GTR is a major train operating company in the UK, managing several rail franchises, including Great Northern. GTR is committed to modernizing its fleet and infrastructure to improve passenger service and operational efficiency, as evidenced by their collaboration with Siemens Mobility on the Class 717 ETCS upgrade.

Siemens Mobility: Siemens Mobility is a leading global provider of transportation solutions, including rolling stock, infrastructure, and digital services. Their expertise in digital signalling, as demonstrated by the ETCS implementation on the Class 717 trains, is central to modernizing the railway network. Siemens Mobility’s commitment to the ECDP underscores its strategic role in the future of rail transport.