The Northern City Line (NCL) between Finsbury Park and Moorgate has reached a major milestone, marking one year since the complete removal of physical lineside signals and the transition to full digital, in‑cab signalling.
Since May 2025, almost 70,000 Great Northern services have been operated using ETCS digital signalling, making the NCL Britain’s first fully ‘no signals’ commuter railway. The achievement represents a pivotal moment in the UK’s transition to digital railway operations and is already delivering measurable performance benefits.
The NCL scheme has been delivered as a pathfinder project for the East Coast Main Line (ECML), where digital signalling is due to begin later this year as part of the £1.4bn Government‑funded East Coast Digital Programme (ECDP). Once complete, the ECML rollout will be the largest and most complex digital signalling migration anywhere in the world.
Crucially, the move from an ETCS ‘overlay’ system to a pure no‑signals railway has driven steady improvements in service reliability. Network Rail, GTR and Siemens Mobility have worked in close partnership to refine operational processes, embedding lessons learned from early teething issues and optimising how drivers, signallers and control teams interact with the system.
Sarah Jane Crawford, Network Rail’s industry partnership director, ECDP, said:
“I’d like to thank all our teams across our partners who have worked hard to embed ‘no signals’ operations on the NCL as part of the regular, day-to-day service pattern.
“We’ve ‘learned by doing’ on NCL, where we successfully secured the necessary approvals and integrated across track and train. We’re now close to beginning the introduction of digital in-cab signalling on the East Coast Main Line, with significant learnings informing a gradual migration plan aimed at ensuring high performance throughout.”
From an operator perspective, the Northern City Line has demonstrated that ETCS can be introduced successfully on an intensive urba]n commuter route, with reliability improvements already evident in day‑to‑day operations.
Raj Patel, GTR’s head of digital signalling, said:
“The NCL project has delivered a standout success, paving the way for a truly ‘no signals’ railway.
“Achieving this transformation on an intensive commuter route in just a year is a remarkable milestone. It’s a testament to the close collaboration across all partners, and it’s already delivering results with improved reliability of signalling assets.
“With that momentum behind us, we’re excited to introduce the first digitally signalled trains on the East Coast Main Line later this year.”
Siemens Mobility has played a central role in delivering both the ETCS technology and the digitally equipped Class 717 fleet, which now operates exclusively under in‑cab signalling on the route.
Richard Cooper, infrastructure lead and ECDP project director, Siemens Mobility UK&I, said:
“This milestone proves digital signalling works reliably and at scale on one of the UK’s most demanding urban routes. Working with GTR and Network Rail, we have delivered a more reliable, connected and sustainable railway, with the Siemens built Class 717 fleet and our ETCS technology at its core.
“These lessons now underpin the next step of introducing ETCS to the East Coast Main Line to help transform rail travel and transport for passengers and freight across the network.”
Workforce engagement and safety assurance have also been central to the project’s success, with unions closely involved throughout the transition.
Gadge Grocott, ASLEF’s health and safety representative for Hitchin, said:
“I have had the pleasure of welcoming, last year, the introduction of ETCS on the Northern City Line. Updating the antiquated equipment into a modern Class A system is a huge project, involving the retraining of drivers, signallers, and managers. A successful 12 months has seen continued improvement with consultation and cooperation at all levels.”
The benefits of the NCL programme are now directly shaping preparations for long‑distance and high‑speed operations on the ECML.
Dr Linda Wain, engineering and safety director for LNER, said:
“The learnings that have been taken from the NCL project have been invaluable for ETCS being introduced to the East Coast Main Line. We’re really looking forward to next year and running our Azuma fleet in ETCS and realising the benefits digital signalling brings for customers and the railway.”
As digital signalling moves from pilot to mainstream deployment, the Northern City Line stands as a proof‑of‑concept for a safer, greener and more reliable railway, setting the blueprint for the next phase of Britain’s rail modernisation.
Image credits: Network Rail
