 This reflects the fact that many journeys undertaken in the area are short and "local" in nature, and that the area as a whole is fairly small in size (as the map shows, it does not extend a very long way from London in any direction).To compensate for the problems and disruption experienced on the railway network between 2000 and 2002, Network Railcards bought in the early months of 2002 (until 18 May 2002) were issued for 15 months for the price of 12.The Heathrow Express service between London Paddington and Heathrow Airport, which was introduced in 1998, was excluded until March 2006.