A Eurostar high-speed train speeds on the LGV Nord rail track outside Saint-Leger, France, January 22, 2021. REUTERS/Pascal Rossignol

A Eurostar high-speed train speeds on the LGV Nord rail track outside Saint-Leger, France, January 22, 2021. REUTERS/Pascal Rossignol

An information board is displayed at the Eurostar terminal at Gare du Nord train station, amidst the coronavirus disease (COVID-19) pandemic, in Paris, France December 23, 2020. REUTERS/Benoit Tessier

Police officers and security personnel are seen at the Eurostar terminal at Gare du Nord train station, amidst the coronavirus disease (COVID-19) pandemic, in Paris, France December 23, 2020. REUTERS/Benoit Tessier

Passengers arrive at the Eurostar terminal at Gare du Nord train station, amidst the coronavirus disease (COVID-19) pandemic, in Paris, France December 23, 2020. REUTERS/Benoit Tessier

Passengers arrive at the Eurostar terminal at Gare du Nord train station, amidst the coronavirus disease (COVID-19) pandemic, in Paris, France December 23, 2020. REUTERS/Benoit Tessier

Passengers arrive at the Eurostar terminal at Gare du Nord train station, amidst the coronavirus disease (COVID-19) pandemic, in Paris, France December 23, 2020. REUTERS/Benoit Tessier

Passengers arrive at the Eurostar terminal at Gare du Nord train station, amidst the coronavirus disease (COVID-19) pandemic, in Paris, France December 23, 2020. REUTERS/Benoit Tessier

Passengers wait in line at the Eurostar terminal at St Pancras International, amidst the spread of the coronavirus disease (COVID-19) pandemic, in London, Britain, December 23, 2020. REUTERS/Hannah McKay

A passenger has his documents checked at the Eurostar terminal at St Pancras International, amidst the spread of the coronavirus disease (COVID-19) pandemic, in London, Britain, December 23, 2020. REUTERS/Hannah McKay

A passenger has her documents checked at the Eurostar terminal at St Pancras International, amidst the spread of the coronavirus disease (COVID-19) pandemic, in London, Britain, December 23, 2020. REUTERS/Hannah McKay

A passenger with a suitcase stands at the Eurostar terminal at St Pancras International, amidst the spread of the coronavirus disease (COVID-19) pandemic, in London, Britain, December 23, 2020. REUTERS/Hannah McKay

A passenger with his luggage walks at the Eurostar terminal at St Pancras International, amidst the spread of the coronavirus disease (COVID-19) pandemic, in London, Britain, December 23, 2020. REUTERS/Hannah McKay

The Eurostar trains are parked on a platform at St Pancras station, amidst the spread of the coronavirus disease (COVID-19) pandemic, in London, Britain, December 23, 2020. REUTERS/Hannah McKay

A sign is pictured at the Eurostar terminal at St Pancras International, amidst the spread of the coronavirus disease (COVID-19) pandemic, in London, Britain, December 23, 2020. REUTERS/Hannah McKay

A police officer checks documents of a passenger at the Eurostar terminal at St Pancras International, amidst the spread of the coronavirus disease (COVID-19) pandemic, in London, Britain, December 23, 2020. REUTERS/Hannah McKay

Passengers wait in line at the Eurostar terminal at St Pancras International, amidst the spread of the coronavirus disease (COVID-19) pandemic, in London, Britain, December 23, 2020. REUTERS/Hannah McKay

A passenger walks with his luggage at the Eurostar terminal at St Pancras International, amidst the spread of the coronavirus disease (COVID-19) pandemic, in London, Britain, December 23, 2020. REUTERS/Hannah McKay

Passengers queue at the Eurostar terminal at St Pancras International, amidst the spread of the coronavirus disease (COVID-19) pandemic, in London, Britain, December 23, 2020. REUTERS/Hannah McKay

Passengers wait in line at the Eurostar terminal at St Pancras International, amidst the spread of the coronavirus disease (COVID-19) pandemic, in London, Britain, December 23, 2020. REUTERS/Hannah McKay

A view of the Eurostar trains parked on a platform at St Pancras station, as EU countries impose a travel ban from the UK following the coronavirus disease (COVID-19) outbreak, in London, Britain, December 21, 2020. REUTERS/Hannah McKay

Security guards patrol at the area of the closed Eurostar terminal at Brussels South railway station after Britain's European neighbors began closing their doors to travelers from the United Kingdom amid alarm about a rapidly spreading strain of coronavirus, in Brussels, Belgium December 21, 2020. REUTERS/Yves Herman

A woman walks past the closed entrance of the Eurostar terminal at Brussels South railway station after Britain's European neighbors began closing their doors to travelers from the United Kingdom amid alarm about a rapidly spreading strain of coronavirus, in Brussels, Belgium December 21, 2020. REUTERS/Yves Herman

An information board is pictured at the Eurostar terminal at St Pancras International, as EU countries impose a travel ban from the UK following the coronavirus disease (COVID-19) outbreak, in London, Britain, December 21, 2020. REUTERS/Hannah McKay

A man looks at the closed entrance of the Eurostar terminal at Brussels South railway station after Britain's European neighbors began closing their doors to travelers from the United Kingdom amid alarm about a rapidly spreading strain of coronavirus, in Brussels, Belgium December 21, 2020. REUTERS/Yves Herman

A woman looks at a timetable outside the closed Eurostar terminal at Brussels South railway station after Britain's European neighbors began closing their doors to travelers from the United Kingdom amid alarm about a rapidly spreading strain of coronavirus, in Brussels, Belgium December 21, 2020. REUTERS/Yves Herman

A security guard patrols past the closed entrance of the Eurostar terminal at Brussels South railway station after Britain's European neighbors began closing their doors to travelers from the United Kingdom amid alarm about a rapidly spreading strain of coronavirus, in Brussels, Belgium December 21, 2020. REUTERS/Yves Herman

Travellers with they suitcases sit at the Eurostar terminal at St Pancras International, as EU countries impose a travel ban from the UK following the coronavirus disease (COVID-19) outbreak, in London, Britain, December 21, 2020. REUTERS/Hannah McKay

An information board is pictured at the Eurostar terminal at St Pancras International, as EU countries impose a travel ban from the UK following the coronavirus disease (COVID-19) outbreak, in London, Britain, December 21, 2020. REUTERS/Hannah McKay

A view of an empty Eurostar terminal at St Pancras International, as EU countries impose a travel ban from the UK following the coronavirus disease (COVID-19) outbreak, in London, Britain, December 21, 2020. REUTERS/Hannah McKay

A view of an empty Eurostar terminal at St Pancras International, as EU countries impose a travel ban from the UK following the coronavirus disease (COVID-19) outbreak, in London, Britain, December 21, 2020. REUTERS/Hannah McKay

A traveller walks with a suitcase past an information board at the Eurostar terminal at St Pancras International, as EU countries impose a travel ban from the UK following the coronavirus disease (COVID-19) outbreak, in London, Britain, December 21, 2020. REUTERS/Hannah McKay

A Eurostar staff member is seen inside the closed Eurostar terminal at Brussels South railway station after Britain's European neighbors began closing their doors to travelers from the United Kingdom amid alarm about a rapidly spreading strain of coronavirus, in Brussels, Belgium December 21, 2020. REUTERS/Yves Herman

A woman walks past the closed entrance of the Eurostar terminal at Brussels South railway station after Britain's European neighbors began closing their doors to travelers from the United Kingdom amid alarm about a rapidly spreading strain of coronavirus, in Brussels, Belgium December 21, 2020. REUTERS/Yves Herman

Eurostar timetable is seen outside the closed Eurostar terminal at Brussels South railway station after Britain's European neighbors began closing their doors to travelers from the United Kingdom amid alarm about a rapidly spreading strain of coronavirus, in Brussels, Belgium December 21, 2020. REUTERS/Yves Herman

People walk past the closed entrance of the Eurostar terminal at Brussels South railway station after Britain's European neighbors began closing their doors to travelers from the United Kingdom amid alarm about a rapidly spreading strain of coronavirus, in Brussels, Belgium December 21, 2020. REUTERS/Yves Herman

A woman walks past the closed entrance of the Eurostar terminal at Brussels South railway station after Britain's European neighbors began closing their doors to travelers from the United Kingdom amid alarm about a rapidly spreading strain of coronavirus, in Brussels, Belgium December 21, 2020. REUTERS/Yves Herman

People walk past the closed entrance of the Eurostar terminal at Brussels South railway station after Britain's European neighbors began closing their doors to travelers from the United Kingdom amid alarm about a rapidly spreading strain of coronavirus, in Brussels, Belgium December 21, 2020. REUTERS/Yves Herman

People stand on the platform next to the last scheduled Eurostar train from London to Paris ahead of travel restrictions imposed by the French government on the UK, amid the coronavirus disease (COVID-19) pandemic, in London, Britain December 20, 2020. REUTERS/Toby Melville

Train staff boards the last scheduled Eurostar train from London to Paris ahead of travel restrictions imposed by the French government on the UK, amid the coronavirus disease (COVID-19) pandemic, in London, Britain December 20, 2020. REUTERS/Toby Melville

Train personnel wave to each other as one of them boards the last scheduled Eurostar train from London to Paris ahead of travel restrictions imposed by the French government on the UK, amid the coronavirus disease (COVID-19) pandemic, in London, Britain December 20, 2020. REUTERS/Toby Melville

Train personnel board the last scheduled Eurostar train from London to Paris ahead of travel restrictions imposed by the French government on the UK, amid the coronavirus disease (COVID-19) pandemic, in London, Britain December 20, 2020. REUTERS/Toby Melville

The final passengers board the last scheduled Eurostar train from London to Paris ahead of travel restrictions imposed by the French government on the UK, amid the coronavirus disease (COVID-19) pandemic, in London, Britain December 20, 2020. REUTERS/Toby Melville

French railway SNCF CEO Jean-Pierre Farandou (L) and Eurostar CEO Jacques Damas pose during a tour of the Eurostar terminal in Gare du Nord, to check on the new control facilities ahead of an effective Brexit, in Paris, France December 10, 2020. Eric Piermont/Pool via REUTERS

French Junior Minister of Public Action and Accounts Olivier Dussopt and Minister for European Affairs Clement Beaune tour the Eurostar terminal in Gare du Nord, to check on the new control facilities ahead of an effective Brexit, in Paris, France December 10, 2020. Eric Piermont/Pool via REUTERS

French Junior Minister of Public Action and Accounts Olivier Dussopt and Minister for European Affairs Clement Beaune speak to the media during a tour of the Eurostar terminal in Gare du Nord, to check on the new control facilities ahead of an effective Brexit, in Paris, France December 10, 2020. Eric Piermont/Pool via REUTERS

Eurostar CEO Jacques Damas, French railway SNCF CEO Jean-Pierre Farandou, Junior Minister of Public Action and Accounts Olivier Dussopt and Minister for European Affairs Clement Beaune tour the Eurostar terminal in Gare du Nord, to check on the new control facilities ahead of an effective Brexit, in Paris, France December 10, 2020. Eric Piermont/Pool via REUTERS

French railway SNCF CEO Jean-Pierre Farandou, Junior Minister of Public Action and Accounts Olivier Dussopt and Minister for European Affairs Clement Beaune tour the Eurostar terminal in Gare du Nord, to check on the new control facilities ahead of an effective Brexit, in Paris, France December 10, 2020. Eric Piermont/Pool via REUTERS

French Junior Minister of Public Action and Accounts Olivier Dussopt (L) and Minister for European Affairs Clement Beaune pose during a visit to the Eurostar terminal in Gare du Nord, to check on the new control facilities ahead of an effective Brexit, in Paris, France December 10, 2020. Eric Piermont/Pool via REUTERS

An empty Eurostar terminal is seen at London St Pancras station, amid the coronavirus disease (COVID-19) outbreak in London, Britain, September 23, 2020. REUTERS/Hannah McKay

An empty Eurostar terminal is seen at London St Pancras station, amid the coronavirus disease (COVID-19) outbreak in London, Britain, September 23, 2020. REUTERS/Hannah McKay

A man pushes luggage past the Eurostar terminal at London St Pancras station, amid the coronavirus disease (COVID-19) outbreak in London, Britain, September 23, 2020. REUTERS/Hannah McKay

EU's Brexit negotiator Michel Barnier departs the Eurostar in London, Britain September 9, 2020. REUTERS/Peter Nicholls

EU's Brexit negotiator Michel Barnier departs the Eurostar in London, Britain September 9, 2020. REUTERS/Peter Nicholls

Passengers and staff wearing protective face masks arrive from Paris at Eurostar terminal at St Pancras station, as Britain imposes a 14-day quarantine on arrival from France from Saturday, following the outbreak of the coronavirus disease (COVID-19), in London, Britain August 14, 2020. REUTERS/Peter Nicholls

Passengers wearing protective face masks arrive from Paris at Eurostar terminal at St Pancras station, as Britain imposes a 14-day quarantine on arrival from France from Saturday, following the outbreak of the coronavirus disease (COVID-19), in London, Britain August 14, 2020. REUTERS/Peter Nicholls

Passengers wearing protective face masks arrive from Paris at Eurostar terminal at St Pancras station, as Britain imposes a 14-day quarantine on arrival from France from Saturday, following the outbreak of the coronavirus disease (COVID-19), in London, Britain August 14, 2020. REUTERS/Peter Nicholls

Passengers wearing protective face masks arrive from Paris at Eurostar terminal at St Pancras station, as Britain imposes a 14-day quarantine on arrival from France from Saturday, following the outbreak of the coronavirus disease (COVID-19), in London, Britain August 14, 2020. REUTERS/Peter Nicholls

Passengers wearing protective face masks arrive from Paris at Eurostar terminal at St Pancras station, as Britain imposes a 14-day quarantine on arrival from France from Saturday, following the outbreak of the coronavirus disease (COVID-19), in London, Britain August 14, 2020. REUTERS/Peter Nicholls

Passengers wearing protective face masks arrive from Paris at Eurostar terminal at St Pancras station, as Britain imposes a 14-day quarantine on arrival from France from Saturday, following the outbreak of the coronavirus disease (COVID-19), in London, Britain August 14, 2020. REUTERS/Peter Nicholls