London ready for Olympics, but Tube a worry

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Local schoolchildren waving UniJack flags as they cheer Wakefield Englduring Day 38 Lond2012 Olympic Torch Relay Monday June 25 2012.

Local schoolchildren waving Union Jack flags as they cheer in Wakefield, England, during Day 38 of the London 2012 Olympic Torch Relay Monday June 25, 2012. | AP Photo/Ben Birchall/LOCOG

Schoolchildren wave UniJack flags as they cheer Wakefield Englduring Day 38 Lond2012 Olympic Torch Relay. | AP Photo/Ben Birchall/LOCOG

Schoolchildren wave Union Jack flags as they cheer in Wakefield, England, during Day 38 of the London 2012 Olympic Torch Relay. | AP Photo/Ben Birchall/LOCOG

People pose for photographs beside Lond2012 Olympic games mascots shopping mall next Olympic Park as final preparations are made ahead

People pose for photographs beside the London 2012 Olympic games mascots in a shopping mall next to the Olympic Park as final preparations are made ahead of the London games, in east London. | AP Photo/Alastair Grant

Signs pointing Olympic Park are seen Stratford underground statias final preparations are made ahead Lond2012 Olympic games east London. |

Signs pointing to the Olympic Park are seen at Stratford underground in station as final preparations are made ahead of the London 2012 Olympic games, in east London. | AP Photo/Alastair Grant

Police officers direct passengers beneath signs pointing Olympic Park as final preparations are made ahead Lond2012 Olympic games east London.

Police officers direct passengers beneath signs pointing to the Olympic Park as final preparations are made ahead of the London 2012 Olympic games, in east London. The opening ceremony is scheduled for July 27. | AP Photo/Alastair Grant

A perspoints towards Olympic Park from vantage point department store east London. Many Londoners believe thcity's unreliable century-old subway

A person points towards the Olympic Park from a vantage point in a department store in east London. Many Londoners believe that the city's unreliable, century-old subway system will be problematic during the 2012 Olympic games. | AP Photo/Alastair Grant

Final preparations are made ahead Lond2012 Olympic games east London.| AP Photo/Alastair Grant

Final preparations are made ahead of the London 2012 Olympic games, in east London.| AP Photo/Alastair Grant

LONDON — The stadium is up and ready to go, the final rehearsals all completed. In central London’s main shopping district, rows of giant flags representing 206 countries flutter over Regent Street, reminding even the most focused shopper: The Olympics are here. London’s cheerleading mayor, …