First compiled by the late H. Howson in the early 1950s, "London's Underground" has been published regularly for more than 50 years. Widely regarded as the most comprehensive general history of the Underground, the book's 10th edition was published in 2003. At the time of the publication of the last edition the book concluded with the then recent opening of the Jubilee Line extension and the creation of the Private/Public Partnership that was designed to develop an Underground network suitable for the 21st century. On the positive side, in the five years since the publication of the last edition significant investment has gone into the Underground network, but the PPP has proved less than successful with the recent problems with the Metronet consortium. Also, since the publication of the last edition the threat of terrorism has increased and, along with it, the ever present issues of security and privacy, the massive growth in the Oyster card system and the award of the 2012 Olympics to London. The new 11th edition brings the work completely up to date with all the changes that have occurred since 2003, and includes a whole new range of colour illustrations to accompany the text.