The 2,520 railway stations on the National Rail network in Great Britain are classified into six categories (two of which are each divided into two subcategories) by the Department for Transport. The scheme was devised in 1996 and there was a review in 2009 when 106 stations changed categories. The categorisation scheme is owned by Network Rail, the site landlord of most of the stations. Some stations are in more than one category: for instance, at London St Pancras International, the surface platforms are in category A and the Thameslink platforms are in category C1.