THE State Government will preserve a corridor of land from the Cudgegong Rd terminus of the North West Rail Link at Rouse Hill through Schofields to Marsden Park.

A transport corridor from Marsden Park to Mount Druitt to Western Sydney Employment Area to Fairfield and Leppington will also be set aside.

The announcement was contained in the NSW Long Term Transport Master Plan released in December.

"The process of reserving important transport corridors will enable the cost efficient, long term development of the transport network," read the report.

The decision followed a lengthy community consultation process, which sought local views on whether the North West Rail Link should one day extend through Schofields to Riverstone station, or through to Marsden Park via a interchange at Schofields station.

The interchange will be necessary as the planned metro-style rail link will not be compatible with the existing heavy rail of the Richmond line.

Blacktown mayor Len Robinson welcomed the decision.

"This decision endorses recommendations that council has made to successive state governments regarding the essential need to preserve future transport and extend major transport corridors that link the North West Rail to the Western Rail and further to the South," he said.

"The government has listened to council's vision and council is delighted that the government supports our vision for the future of transport in Western Sydney."