Property owners whose land values would soar on the back of the development of a light rail line around Parramatta should help fund the infrastructure, a conference has heard.

Sydney Business Chamber western Sydney director David Borger said two light rail lines, rather than one, could be built if a "betterment levy" was paid by private landowners who benefited from their construction.

An artist's impression of the Parramatta light rail.

Mr Borger also said value capture, a form of public financing that aims to recover profits that land owners get from public infrastructure, would accelerate the building of the light rail line and make the project less reliant on expansions in state government funding.

"The Harbour Bridge had a levy that stayed on for 15 years and helped pay for some, not all of it. I don't think we can ignore the potential for value capture in this conversation," Mr Borger told the Western Sydney Light Rail Conference in Parramatta on Friday.