Highlands and Islands Enterprise (HIE)

The warning is contained in a report by public agency Highlands and Islands Enterprise.

It was running in January 2023 following £25m of repairs before it was closed again due to snagging issues.

The facility in Sutherland was to be the UK's first but there are now doubts over its future.

The railway opened last January following a four-year closure but was shut down again in August.

The Cairngorm funicular was shut temporarily in August and had been expected to reopen this month.

The Cairngorm funicular reopened in January after a four-year closure due to structural problems.

Scottish government agency HIE said the deal ended legal actions over the Cairngorm funicular.

The 14,302-acre safety zone would be put in place during launches at Sutherland Spaceport.