High-speed rail operator Eurostar is to be a tier three sponsor of the London 2012 Olympics, becoming the Games' 30th domestic sponsor.

The company has become Official International Rail Services Provider and will be providing arrival and departure services at St Pancras International for those competing and working at the Games who are travelling to London on its trains. It will also provide international rail services for London 2012's operational requirements. Outside of its sponsorship with LOCOG, Eurostar will be carrying spectators from mainland Europe to and from the Games in 2012 itself.

The company has also acquired rights in France and Belgium and become a partner of the French and Belgian National Olympic Committees. As part of these deals, the French and Belgian Olympic teams will travel to and from the Games using Eurostar services. As part of its sponsorship of the Games, Eurostar will be conducting a number of activations across the UK, France and Belgium to promote London 2012 as a sustainable event.

The first main Eurostar activation is the Tri-City-Athlon planned for 14 September 2010 which takes places across the three capital cities that Eurostar serves. Over one day participants will do a swim in Paris, a cycle in Brussels and a run in London.