Rail passengers in the north-east have been urged to leave plenty time to travel – as they face months of bus replacement services.
Network Rail is planning to close part of the Aberdeen to Huntly line as part of a £300 million project to dual the track between Aberdeen and Inverness.
Work will begin in May with disruption expected until August.
The line will be shut between Dyce and Inverurie from May 4 to June 14, and from Dyce to Huntly from June 15 to August 9.
A bus replacement service will be in operation during the 14-week closure.
Rail passengers will also swap the track for the road for three days from August 10-12 between Aberdeen to Inverness for the engineering works.
A shorter closure between Aberdeen and Huntly will be in effect from August 13-19.
Engineers will lay 10 miles of rail, and replace or refurbish 19 bridges during the work.
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Neil Baillie, councillor for Inverurie and District, said: “We are trying to keep the stress to the public during works to a minimum by letting people know about the bus replacement services.
“What I would say to travellers is to check before they travel and have a look at the ScotRail website so they can see the times.
“We are sorry about the inconvenience people will be facing, but people will see there will be big improvements in the future.
“This work has been required for many years and we will fully get the benefit of it when the work is completed later this year.”
Billy McKay, Network Rail senior programme manager, said: “Double-tracking the line between Aberdeen and Inverurie will improve reliability on the route and allow a significant increase in the number of services available.
“The Aberdeen-Inverness Improvement Project means more services, more seats and faster journeys for passengers and our engineers will be working around-the-clock to complete this complex programme.
“We understand the inconvenience the work will cause to some passengers and residents, but such huge engineering projects cannot be delivered without the closure of the line. We are encouraging customers to leave extra time for travel.”