Commuters fear strain on trains

Travelers try to find a space on a packed rush hour tube train in central London, in this November 29, 2010, file photo. London is experienced at staging major events, such as April's royal wedding, but the 2012 Olympics stretch over two weeks and sports fans will be jostling for seats on trains and buses with art lovers attending the Cultural Olympiad, as well as business people and tourists. Andrew Winning / Reuters