Train passengers heading to London are facing disruption as work begins on the new high speed Channel Tunnel rail link.
Passengers will have to change at Luton
St. Pancras Station in London is set to become the centre of the new link and work on the £5.2bn project is due to be completed in 2007.
The work means the station will close for three years.
Commuters will change trains at Luton until Monday when a temporary station near St Pancras is due to open.
The project, led by Japanese construction contractor Nishimatsu-Cementation Skanska, is estimated to take three more years to complete.
Midland Mainline, which runs a service to the capital via the East Midlands, says travellers will arrive in London at a station being built 300 yards to the north of the existing one.
Work on the 70-mile Channel Tunnel link has involved the use of two drills each the length of a football pitch to create a five-mile stretch of tunnel under London.
One of the drills used in the original Channel Tunnel project is being auctioned on eBay.
The new link will reduce the time it takes passengers to reach other European cities such as Paris, Amsterdam, Cologne and Brussels.
Train operator Eurostar has decided the name of the 19th Century station is too obscure - and needs be changed.
London Central and London International are possible options for the new name.