Macquarie Fields MP Andrew McDonald said it's important the locals living alongside the freight line, who already have to contend with noise from commuter trains, receive noise barriers of some kind.

``My argument will be that the State Government should pay for half of the cost of the barriers and that is the argument I've been putting to the Premier and the Transport Minister,'' Dr McDonald said.

His motion is made up of three points, which call on his government colleagues to: ``note the concerns of the residents of Casula about the adverse health effects of rail noise on their lives'', ``note that these noise effects will increase with the construction and utilisation of the Southern Sydney Freight line by the Australian Rail Track Corporation'', and ``call on all levels of government to work to find a solution that results in effective noise barriers for all of the residents of Casula''.

Dr McDonald's motion was placed on the Legislative Assembly motions list last Wednesday, but has not yet been discussed in Parliament.

He said his motion was inspired by the Greens' intention to move a bill in the Legislative Council, calling on the State Government to take full financial responsibility for the noise barriers.

``When they suggested moving a bill, I thought that there was no real chance that could be passed,'' he said.

``But a motion is a great idea, because it makes more members aware of the issue and gets everyone talking about it.''

Liverpool MP Paul Lynch said he had met several constituents about the noise barriers on ``many, many occasions''.

``I've certainly spoken in Parliament on a number of occasions concerning the freight line,'' Mr Lynch said.