Rail passengers might have to pay up to 10% more for tickets, with new year rail fare hikes due to be announced.
Regulated fares, including season tickets, will see a 5.8% increase in January next year under the existing annual price rise formula.
However, this being an average figure, some fares are likely to see a greater increase. Unregulated fares, which include off-peak services, have no annual price cap.
From January 2012, the base of the annual price rise formula will be RPI (retail price index) of inflation plus 3%, as against the current RPI plus 1%.
Gerry Doherty, leaders of the TSSA transport union, said: "It will be outrageous if commuters are forced to accept massive fare increases when workers across the country are having their pay frozen and are suffering job losses.
"This will be seen as sick joke as we have the most expensive and overcrowded railways in Europe."
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