This terrifying real-time mystery set on a train hurtling from Glasgow to London takes the nerve-jangling suspense of 24 and Bodyguard and speeds them up.
The project, which began in 2012, involved plans for a 4 mile (6.5km) rail link to allow train services from Reading and Slough to reach Heathrow using a tunnel.
Eurostar is looking to expand its services between London and the Continent as it prepares to place an order for up to 50 new trains.
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