Rail passengers travelling on the first working day of 2018 are being hit with the largest fare rise in five years.
Average ticket prices across Britain went up by 3.4% on Tuesday.
Stephen Joseph, chief executive of the Campaign for Better Transport (CBT), accused the Government of choosing to 'snub rail passengers' by continuing to raise fares while fuel duty is frozen for a seventh consecutive year.
The Government uses the previous July's Retail Prices Index (RPI) measure of inflation to determine increases in regulated fares - 3.6% in 2017.
These are around half of all tickets and include season tickets on most commuter routes and some off-peak return tickets on long-distance journeys.
Train operating companies set the prices of other tickets but are bound by competition rules.
Bruce Williamson, of campaign group Railfuture, warned that 'people are being priced out of getting to work'.
He called for the Consumer Price Index (CPI) inflation measure to be used for regulated fare increases.
It is normally lower than RPI and is used by the Government to set increases in benefits and pensions.
Mr Williamson said:
A Department for Transport spokesman said: