Further disruption is set to be caused on Thameslink and Great Northern rail services, due to a national overtime ban by the Aslef trade union.
As a result, trains will make their final journeys at 10pm on Saturday (August 5), with customers advised to complete their journeys "well in advance" of this time.
Amended timetables will continue to be in use.
The disruption follows industrial action by the RMT Union on Saturday (July 29) and Sunday (July 30).
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A further overtime ban has been announced by Aslef, from August 7 to August 12.
Govia Thameslink Railway's network operations and performance director said: "We are very sorry to everyone that will be impacted by the service in place this Saturday.
"As with previous overtime bans, we can only run an amended timetable – and this means fewer services overall.
“We’re running as many trains as possible, but a limited service does mean we can’t run trains as late as we usually would on a Saturday.
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"We completely understand how frustrating this is for our customers and we apologise if this disrupts your plans.
"Our advice is to check every journey this Saturday and don’t wait for those last trains of the day.”
Journeys can be checked via the National Rail website: www.nationalrail.co.uk
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