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The Eurostar now plunges back into a short tunnel for its own crossing underneath the Thames, emerging the other side in the county of Kent.
Some Eurostar trains now call at Ebbsfleet station in north Kent, near the M25 motorway.
Within a minute or two the Eurostar enters a covered bridge across the tracks leading out of the adjacent Kings Cross station, which becomes a long tunnel under east London taking the Eurostar east and south.
About 5 minutes after leaving St Pancras, you'll see a glimpse of daylight and the platforms of Stratford International station, only served by the domestic high-speed trains.
As you settle into your seat, the brakes hiss off and the Eurostar very gently eases itself out of the magnificent arched trainshed of St Pancras International Station.
At this stage, the train is heading north, but almost immediately it makes a sharp right-hand turn past the huge steel gasometers that have been a familiar sight behind Kings Cross/St Pancras for years and which are now, believe it or not, listed structures.
Now at last you're in green and pleasant rural Kent, with villages nestling at the foot of the chalky hills to the left.
A few Eurostars still call at Ashford International station, a major railway junction in east Kent, but most Eurostars now 'fly' over the town on a huge flyover, with the station way below you, the town centre to the left and the old Southern Railway Ashford works to your right.
Eurostar is the high-speed passenger train linking London with Paris, Lille & Brussels via the Channel Tunnel at up to 300km/h or 186 mph.
The Eurostar train is now running at its full service speed of 186mph (300 km/h), with traffic on the adjacent London-Dover M2 motorway almost standing still in comparison.
Just 15-20 minutes after leaving London, the train crosses the most dramatic structure on the new high-speed line, the viaduct high over the River Medway.
The Channel Tunnel (sometimes called the 'Chunnel', but usually only by Americans) is just like any other rail tunnel, only a bit longer.
As a precaution, the yellow fire safety doors between each pair of coaches are closed during the tunnel transit, but you can still pass through freely if you want.They were refurbished with an interior by designer Philippe Starck in 2004-2005.