Growth on the state's public transport network has hurtled past long-term government predictions, with 93 million more trips taken on buses and trains last year than what was forecast for 2031.

A report used by the NSW government as the “framework” for investing tens of billions in transport projects over the coming decades predicted rail growth would increase by 26 per cent between 2011 and 2031.

However, the rail network reached and then exceeded that predicted figure by 2017, more than a decade early.

The projection, made in the 2012 report, for bus growth was also reached 13 years early. Last year, the number of bus trips was 54 million higher than the forecast.