The National Trust is calling for election pledges to revive the crumbling Flinders Street Station, a year after selection of a winning design to revitalise the station, saying it remains half-unoccupied and ''falling to pieces''.

Trust chief executive officer Martin Purslow said the group was planning to write to the major parties ahead of the November state election seeking a commitment to proceed with the works on the century-old station.

“They really do need to get a grip and they need to make an election pledge - what are they going to do?” he said.

“OK, they’ve had a design competition, OK, they’ve come up with some good ideas. But where does that actually leave us? We’d like to see a commitment not just to a design competition, but actually what are you going to do with Flinders Street Station and its environs.”

An international design competition was run by the government, with the $500,000 first prize taken out last August by the Melbourne and Swiss team of HASSELL + Herzog & de Meuron. The design restores the heritage buildings, and adds a vaulted roof over the platforms, a public art gallery, public plaza, amphitheatre and a marketplace.