The turntable, roundhouse and workshops at the Genesee and Wyoming rail site have been provisionally listed on the South Australian Heritage register.
The decision was made by the SA Heritage Council during their December 12 meeting after a member of the public nominated the site back in March 2019.
Railway museum president Peter Knife said he read the application and thought it was very thorough.
"It's exciting that we have that possibility that the wider railway precinct is going to be preserved," he said.
"It is the only fully integrated (rail) workshop left in the state and externally it is still virtually in its original 1920s, 1930s state."
However Mr Knife said either dedicated volunteers or a new industry to work at the site was needed to preserve it well into the future, as a heritage listing did not guarantee its survival.
"It's a wonderful recognition of an almost lost icon, the last in the state...if there could be some practical way of maintaining it then that would be wonderful for Port Lincoln," he said.
He said volunteers would acknowledge the listing however the museum, based in the heritage-listed old station building, would not expand down to the workshops.
The listing is open for public consultation until April 13 and submissions need to address criteria under Section 16 of the Heritage Places Act.
Forms are available at environment.sa.gov.au/topics/heritage/sa-heritage-register/entries-confirmations and are to be sent to the executive officer, SA Heritage Council, GPO Box 1047, Adelaide SA 5001 or emailed to DEWHeritage@sa.gov.au.
After the consultation period the heritage council will consider the submissions and decide whether to confirm the site in the South Australian Heritage Register.