The towering machines clustered in a cavernous workshop in Redfern make up one of the world's best preserved yet still functioning blacksmithing workshops.

Nestled within the 13 hectares of the Australian Technology Park is the Eveleigh Locomotive Workshop, a heritage-protected site for wrought-iron and steel craftsmanship.

Craftsmen: Anthony Potts watches blacksmith Guido Gouverneur. Credit:Dominic Lorrimer

But the future of the iconic collection is in doubt as the state government prepares to offload the multi-million dollar park this year.

Wendie McCaffley has managed the workshop and its team of 30 for decades. She said she was deeply concerned it would no longer be managed by the government when the lease expires in 2020.