Regulated train fares are set to rise by an average 4.1% from January after the headline rate of retail price index nflation fell to 3.1% in July from 3.3% in June. Labour has pledged to cap fare rises if it gets into power.
Asked why rail fares continue to rise, the chief executive of the Association of Train Operating Companies said it was in part to fund better services and in part to lower the contribution from the taxpayer.
Michael Roberts told BBC Radio 4's Today programme that the government is trying to reduce the proportion of the cost of rail transport paid by the taxpayer to around 20 percent.
The Government has defended its track record on rail fares and promised to announce further measures to ensure "greater fairness" for travellers.
A Department for Transport spokesman said the Coalition were investing "record amounts" in the railways and recognised current prices were "tough".
The Government is investing record amounts into our railways, which will help deliver economic growth, improve performance and significantly boost passenger capacity.
However, we also recognise it is tough for passengers. That is why we are already limiting these rises by capping the average regulated fares increase at 1% in real terms and will be announcing further measures to ensure greater fairness on fares for passengers later this year.
Train fares are set to rise yet again on the back of the release of July's inflation figures, forcing rail passengers to fork out more for travel in 2014.
Inflation as measured by the retail prices index (RPI) is expected to remain at 3.3 percent for July, giving train companies the opportunity to push through a price rise of 4.3 percent at the beginning of next year.
The Government determines rail price rises by allowing fares to rise one percentage point above July's RPI measure.
Rail passengers were already dealt a blow with 2013 prices. This year the cost of a season ticket rose by 4.2 percent and overall train fares increased by around 3.9 percent.