London's transport system is coping well with the huge crowds on Super Saturday - one of the busiest days of the London 2012 Olympic Games.
Tube and train services were busy but moving, transport officials said.
There was a good service on all London Underground lines as hundreds of thousands of people made their way to events across the capital, on a day when 25 gold medals are up for grabs, including for Team GB heptathlon star Jessica Ennis at the Olympic Park in Stratford.
Transport for London said it was expecting 200,000 people to head to east London to watch Ennis and fellow medal prospects including Mo Farah in the 10,000m and cycling's women's team pursuit.
Thousands more were in central London to watch the Olympic triathlon, where Helen Jenkins is bidding to add to Britain's gold tally, plus beach volleyball at Horse Guards Parade and the equestrian events in Greenwich Park.
London's transport commissioner Peter Hendy said: "Yesterday was the busiest day of the Games so far, as the athletics got under way in the Olympic Stadium. We got everyone to their Games events on time and kept London moving and open for business. We expect it to be busy again today."
The Underground saw its record for the most number of passengers carried broken twice this week, with Wednesday seeing 4.25 million and then 4.31 million the following day, it said. Numbers for Friday are still being collated.
The capital's transport operators were given a vote of confidence by commuter group London Travelwatch.
Sharon Grant, the group's chairwoman, said that, while there had been some problems, the disruption caused had been minimal.
"So far our transport operators have excelled themselves, in managing both unprecedented passenger flows, and the expected minor breakdowns on the system," she said. "London commuters have also responded very well indeed to their advice and deserve some recognition."