London's "world class" tube system is on strike today (the third in a series of strikes staged by the RMT).
The network is trying, in between strikes, to upgrade some parts of its service in time for the 2012 Olympics.
As to whether these upgrades will be completed on schedule, and to cost, I cannot say. However, I guarantee that Bob Crow and his "comrades" in the RMT will use the threatened disruption of service during the Olympics as a "bargaining" tool in thier ongoing dispute.
Olympic Medals won during the Beijing 2008 Olympics