Buses have replaced some trains between the two stations.
Another period of industrial action is expected between July 17 and July 22.
A statement released by London Northwestern Railway reads:"Train services running to and from these stations will be cancelled."Disruption is expected until the end of today .🚧 Cancellations to services between Watford Junction and St Albans Abbey: Due to a member of train crew being unavailable between Watford Junction and St Albans Abbey fewer trains are able to run.
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