Concerns raised for Overland train future

The Overland train service between Adelaide and Melbourne is under threat with the South Australian government needing to guarantee funding, the Labor opposition says.

Opposition Leader Peter Malinauskas says no services have been scheduled from January next year with the Overland's continued operation dependent on Great Southern Railway receiving state government assistance.

"Not only does the Overland play an important role in the tourism industry in SA, it also supports regional communities.," Mr Malinauskas said on Sunday.

"Along with contributing funding to this service, the government must use next week's state budget to boost investment in SA's growing tourism sector."

The Overland has operated since 1887 and currently runs two services a week, carrying about 30,000 passengers each year.

In 2015 the former state Labor government announced a $1 million, three-year funding agreement.