Emergency engineering work between Arbroath and Montrose is causing disruption on the railway.
Several services are affected by the closure, including all Scotrail services through Dundee, the East Coast service between London Kings Cross/Leeds and Aberdeen and the CrossCountry between Plymouth and Dundee and also between Dundee and Aberdeen.
The disruption is now expected to last at least until noon.
Replacement bus services will run between Dundee and Aberdeen.
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