It's our project, Labor says of rail link

Labor has ridiculed a $40 million commitment by the coalition to extend a key rail link in Adelaide, saying it's a re-announcement of a Labor project.

In government Labor allocated $31.5 million to the Tonsley Park public transport project that was a casualty of a $4 billion funding cut by the coalition.

"This money go-round is a sleight of hand on the eve of an election that adds nothing to federal support for South Australia," opposition transport spokesman Anthony Albanese said.

He said the money came from the Goodwood to Torrens Junction freight line upgrade recommended by Infrastructure Australia and from the Tonsley Park public transport upgrade funded by Labor with $31 million.

The coalition announcement was simply a reallocation of existing funding and not new money.

"What we need is additional funding not changing funding from safe seats into marginal seats during an election campaign," Mr Albanese told ABC radio.

SA Transport Minister Stephen Mullighan says the state will foot the bill for the rest of the rail extension, "which we're entirely comfortable with".

"This is money that we already have within our infrastructure project budget," he told ABC radio.