Buses will replace trains between two Aberdeen stations next month as work begins on a multi-million-pound upgrade.
The line between Aberdeen and Dyce will close for 14 weeks beginning on May 12.
Engineers will double the track through the area and carry out bridge upgrades.
A total of 12 miles of rail will be laid between the stations as part of the Aberdeen to Inverness improvement project to reduce journey times.
Rail chiefs have warned commuters that journeys will take longer than normal.
Billy McKay, Network Rail programme manager, said: “This project and the new services it will enable will help to improve the flexibility the railway can offer the expanding communities around Aberdeen.
“We understand the inconvenience these works will cause to some passengers, however, such a significant investment in the railway cannot be delivered without this short-term closure of the line.”