Northern City Line marks first anniversary of Britain’s first commuter railway operating entirely without physical signals

Great Northern’s Northern City Line has marked one year since becoming Britain’s first commuter railway to operate entirely without physical lineside signals, representing a major milestone for digital rail operations in the UK.

The route between Moorgate and Finsbury Park transitioned to full digital in-cab signalling during May 2025 as part of the Government-funded East Coast Digital Programme (ECDP). Since the removal of conventional signals, almost 70,000 train services have been operated using the European Train Control System (ETCS).

The Northern City Line project is acting as a pathfinder programme for the wider deployment of digital signalling across the East Coast Main Line, where ETCS operations are expected to begin later this year. The £1.4 billion ECDP programme aims to replace traditional signalling infrastructure with continuous digital information displayed directly inside train driver cabs, improving reliability, efficiency and safety across the network.

Northern City Line provides key lessons for ETCS rollout

The transition from an overlay system, where trains could operate using either conventional or digital signalling, to a fully signal-free railway has already improved service reliability across the route. Project partners, including Govia Thameslink Railway, Network Rail and Siemens Mobility have continued refining operational processes following the introduction of ETCS operations.

Raj Patel, Head of Digital Signalling at GTR, said: “The NCL project has delivered a standout success, paving the way for a truly ‘no-signals’ railway.”

He added that the experience gained through the project would support the introduction of digital signalling across the East Coast Main Line later this year.

Sarah Jane Crawford, Industry Partnership Director for ECDP at Network Rail, said the programme had allowed the industry to “learn by doing” while integrating digital operations across both track and train systems.

Richard Cooper, Infrastructure Lead and ECDP Project Director at Siemens Mobility UK&I, described the milestone as proof that digital signalling can operate reliably at scale on one of the UK’s busiest commuter routes.

The project has also supported wider driver and signaller training for ETCS operations ahead of future deployment across the national rail network.

Dr Linda Wain, Engineering and Safety Director for LNER, said the lessons from the Northern City Line had been “invaluable” ahead of ETCS introduction to the East Coast Main Line and future Azuma fleet operations.

The East Coast Digital Programme is one of the UK rail sector’s largest digital transformation schemes and is expected to play a major role in improving network capacity, operational performance and long term sustainability.