The first official Javelin high-speed rail services that will whisk spectators from London to the Olympic Park in just seven minutes will start running today.
The Japanese-built trains will be operated by the Southeastern train company.
Running from St Pancras station in London to Stratford and then on to Ebbsfleet International station in North Kent, the trains will run eight times an hour.
A Southeastern spokesman said: "Up to 25,000 people an hour could be transported to and from Stratford and St Pancras International stations on the Javelin service at peak times, in less than seven minutes."
The Javelin service will run from today until Sunday August 12 and for the Paralympics between Wednesday August 29 and continue until Sunday September 9.