Successful ETCS software testing on Thameslink’s Class 700 fleet marks another milestone for the East Coast Digital Programme.
Govia Thameslink Railway has successfully completed high speed testing of upgraded digital signalling software on a Class 700 train as part of preparations for the East Coast Digital Programme.
The testing supports the future rollout of the European Train Control System (ETCS) across the East Coast Main Line, replacing traditional lineside signals with continuous in cab digital information for drivers.
Thameslink fleet prepares for digital signalling rollout
The 115 strong Class 700 Thameslink fleet is the largest passenger fleet included within the £1.4 billion East Coast Digital Programme.
Testing took place during separate overnight sessions in April and May on the Thameslink central London core route between London Bridge station and St Pancras International.
The trial used ETCS version 3.6.0 software, an upgraded signalling platform designed to improve operational flexibility on heavily used routes such as the East Coast Main Line.
The work was completed overnight to avoid disruption to scheduled passenger services.
According to the project partners, the upgraded software enables trains to communicate with trackside systems using GPRS packet switching technology, improving resilience and operational efficiency.
Siemens Mobility and Network Rail worked alongside GTR during the testing programme.
GTR currently operates the only passenger services in the UK using ETCS version 3.6.0 technology in live customer operation through its Class 717 fleet on the Northern City Line.
Aaron Meakin said: “We’re extremely proud of the teams delivering this testing, who worked extremely hard to ensure it was completed on time and safely.”
Ricky Barsby said preparing the Class 700 fleet for migration represented “a vital step” towards the next generation railway.
Richard Cooper added that the software upgrade would help deliver a “more reliable, connected and sustainable railway”.
The first passenger ETCS operations on the East Coast Main Line between Welwyn Garden City and Hitchin are expected later during 2026 using Class 717 trains, while the Class 700 fleet is expected to begin migration from 2027.
The upgraded software will also support future ETCS deployment on the Brighton Main Line and Midland Main Line.
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