Part of the Eurostar Terminal at Waterloo, which was closed six years ago, will be used from today during disruption at the station.
One of the platforms will be used by South West Trains to help return services to normal.
It will come into full passenger use next May it was confirmed today.
Commuters have been left frustrated that the station gets crowded and lacks capacity when the former Eurostar platforms are empty since services transferred to St Pancras.
Now one platform will be used by services from Windsor.
Longer term plans to upgrade the station could see more of the platforms used, which would involve major track and building work.
Eurostar has announced that its tickets sales for July to September 2013 reached £207 million - a ten percent increase on the same period last year.
The firm said the number of passengers using its high speed trains through the Channel Tunnel this summer rose by 5% to 2.7 million.
Eurostar has announced plans to launch London-Amsterdam services in 2016.
It aims to take business away from the airlines.
But Kent International Airport, which started daily flights to Amsterdam six months ago, says it's confident it can beat off the competition. John Ryall reports.
Eurostar has signed an agreement with the Dutch railways to launch direct services between London and Amsterdam from December 2016. The deal for the high speed line is due to be ratified by the Dutch Parliament over the coming months.
Eurostar plans to run two services a day between London and Amsterdam with journey times of around four hours.
Kent school children joined Eurostar to celebrate its 10 year anniversary of setting the high speed rail record.
A special plaque has been unveiled today by the driver, Alan Pears, who set the record in Kent.
On July 30, 2003, a Eurostar train sped through Kent countryside to set the record at 208mph on High Speed 1.
The record was taken near Medway Viaduct and to celebrate the record an event is taking place today.
Carrying an increased number of American, Brazilian and Australian travellers, Eurostar saw its operating profit rise from £25.0 million in 2011 to £52.3 million in 2012.
In total, the company carried 9.9 million passengers last year compared with 9.7 million in 2011.
Passenger numbers were strong after the Olympics, with traffic up 5% in the last three months of last year compared with the October-December 2011 period.
While business passenger number remained flat last year, the leisure travel market rose 3%. Non-EU passenger numbers grew 8% in 2012.
Eurostar chief executive Nicolas Petrovic said: "Despite the challenging economic climate, we delivered a strong performance in 2012.
All Eurostar services suspended because of the snow. Mike Pearse reports.
The French authorities have shut the A16 leading to the port of Calais and Eurotunnel. This will cause major delays to freight. Eurostar has suspended passenger services between Britain and France because of the weather. Lines in France are blocked by snow.
The company is advising passengers with tickets for today not to go to Ashford International or St Pancras, they say refunds will be paid.
There is disruption on Eurostar at St Pancras, at Ebbsfleet International and at Ashford International due to train stopped in the tunnel.
A Eurotunnel service has stopped in the Tunnel with a fault, so only one line is open through the Tunnel. The longest delay at present is one hour, though most delays are currently around 30 minutes.
The Olympics, Paralympics and a fluctuating pound/euro exchange rate hit sales revenues in quarter three but Eurostar remain positive. For the year to date, passenger numbers were up from 7.3 million to 7.4 million with sales revenues down 1% to £612 million this year from £619 million in 2011.