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Train fares have increased on some services in south-east England following the expansion of contactless payment systems.
The fare rises stem from aligning paper ticketing time restrictions with Transport for London's contactless structure, leading to services previously available with off-peak tickets now requiring more expensive peak fares.
Rebecca Paul, Conservative MP for Reigate, said that the changes risk "pricing passengers out of rail altogether".
Analysis by lobby group Railfuture indicates that passengers using contactless could pay up to twice as much as those with paper tickets, as railcard or child discounts are not applicable.
Govia Thameslink Railway and the Department for Tranport said that contactless makes travel simpler and easier, with many passengers expected to save money.