Southern Highlands commuters would not be surprised by the Sydney rail system's poor grading in a recent national engineers' report, local MP Peta Seaton said.
Sydney scored a 'C-minus', only just ahead of Adelaide, which has not yet fully electrified its system.
The Rail Technical Association of Australasia report concluded Sydney had failed to maintain its system in line with passenger growth and needed to spend about $20 billion dollars on rail during the next decade.
The association said a C-minus meant the system was "adequate" but in need of major work to avoid future problems.
It also said the State Government's four-year-old Action for Transport 2010 was falling behind schedule.
Ms Seaton said the news would come as no surprise to Southern Highlands commuters.
"We've copped a lot this year," she said.
"We've had a cover-up, we've had the Menangle Bridge issue referred to ICAC (the Independent Commission Against Corruption), we've got the threat of a price increase, we have cleanliness, safety and reliability issues with trains and we still haven't got the report into the Bargo derailment."
She said the report card was a result of the State Government's "fix when fail approach".