Rail passengers travelling between Southport, Manchester and Blackburn will see a reduced service this Sunday.
But British Transport Police officers will be patrolling the trains to make sure that only people with the right reasons are on board.
Northern has released details of its amended timetable for this Sunday (5 April).
A Northern spokesman said: “The impact of coronavirus continues to be felt across the rail industry and, in response to this, Northern has had to reduce the number of services it operates on Sundays.
“Those trains which are still running are intended to help key workers get where they need to be at the weekend.
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“Only essential journeys should be made and anyone travelling for any other reason may be challenged by colleagues from British Transport Police.
“Where trains are not running, Northern is still working to provide rail replacement coaches, but this may not be possible on all routes.”
Anyone planning to travel should check National Rail Enquiries for timings.
Details of the routes that will have rail services Include:
Southport – Blackburn (via Atherton and Todmorden) – this service is split: hourly Southport Southport – Manchester Victoria service and two hourly Manchester Victoria – Blackburn (via Todmorden)
