Trains running to and from St Albans may be delayed by up to ten minutes due to a points failure.
Thameslink say earlier this afternoon a failure was detected in a set of points, which are used by trains to turn around at the station.
Until these are fixed, trains will need to switch direction at other locations such as Harpenden, which may lead to minor delays on some services.
The disruption is expected to last until 3.30pm and if you want to follow updates on Twitter, search for #StAlbans.
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