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.Around 8 minutes after leaving St Pancras, the Eurostar train emerges from the tunnel and starts crossing the wastelands of east London, past warehouses and run-down housing estates.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.To the right of the train as it crosses the viaduct, you'll see small boats moored on the muddy riverbanks far below you.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.Eurostar is owned 55% by SNCF French Railways, 5% by SNCB Belgian Railways & 40% originally by the UK government but now sold to overseas investors.
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.
You still get phone reception inside the tunnel now, with mobile data too.
Large racks near the entrance doors easily take large items.
Anything up to back-pack sized will fit on the overhead racks above your seat.