The Far North Line in the Highlands is set to be “significantly” improved by £11.5m upgrades this summer.
Network Rail said the multi-million pound works, which are set to begin in June, would increase the reliability of rail services for passengers.
The works will refurbish a five-mile stretch of track between Brora and Helmsdale and replace almost nine miles of track between Invergordon and Fearn.
The line will be closed with no trains running north of Dingwall from Sunday, June 8, until Monday, June 30.
Ross Moran, route director at Network Rail Scotland, the “important” project will replace components on the track that are approaching 100 years old.
“There’s never an easy time to close the line, but we know the majority of passengers prefer one continuous period like this, rather than overnight and weekend closures across a much longer timeframe,” he said.
“I’m grateful in advance for the understanding and patience from both passengers and those who live in the area while this work is carried out. Once complete, journeys will be much smoother and more reliable for years to come.”
Mark Ilderton, ScotRail service delivery director, said the temporary disruption was a “vital investment in the future of the route”.
“While the work takes place, we’ll have alternative travel arrangements to keep customers moving and get them where they need to be,” he said.
He added: “This includes running as many trains as we can between Inverness and Dingwall, with rail replacement bus services also operating to minimise disruption.
“We appreciate our customers’ patience and encourage anyone planning to travel to check their journey in advance.”
Dalchalm level crossing will also be temporarily closed during the work, with traffic diverted via the A9.
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