Govia Thameslink Railway (GTR) made the announcement six days after it revealed an initial shutdown of its services.
This followed regular passengers urged to stay at home by Prime Minister Boris Johnson to limit the impact of the coronavirus on the country.
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GTR operates the Southern, Thameslink and Gatwick Express services.
The new “progressive schedule” comes after talks between the government and UK rail operators.
It will take effect on Monday.
The new schedule will include the temporary suspension of Gatwick Express service, “in response to a significant drop in passenger numbers at the airport and to help keep other trains running.”
Steve White, COO of Govia Thameslink Railway, said, “In this national emergency, we and the rest of the rail industry are doing everything we can to make essential services work for the key workers we all depend.
“These changes will allow our staff to focus their efforts on maintaining these essential services. Thameslink and Southern Trains will continue to serve Gatwick.
“Let me repeat the central message of our government and public health in England – travel only if it is absolutely essential.
“Again, I want to thank the key workers, the doctors, the nurses, the police and the other rescuers, for what they do for all of us. I also want to thank my railway colleagues who work so hard to keep the trains running.
“To check your trip next week, please check online with the National Rail Inquiry where the revised schedules will be in place from the weekend. Please note that the coronavirus has a major impact on all of us and that there may be other changes, so check before your trip. ”
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