<P> As of January 2013, there were eight National Rail stations outside the 9 numbered fare zones, where Oyster card pay as you go is permitted and fares are set by the train operating companies . They are located in Essex and Hertfordshire and are organised into additional areas B, C, G and W. On maps these stations are shown as being outside fare zones 1--9 but within the' special fares' Oyster pay as you go area . </P> <P> In January 2016, the Oyster and contactless system was extended to Gatwick Airport in Crawley, West Sussex, and the stations down that line (Horley, Salfords, Earlswood, Redhill and Merstham). </P>

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