Rules for what to do when you reach the border between England and Wales have been set out by First Minister Mark Drakeford.
The Covid rules in England are set to change on Monday, July 19, but will not change in Wales.
It will no longer be a legal requirement, in England, to wear masks in public - including on trains and buses.
Almost all coronavirus restrictions in Wales will be lifted on August 7, but the wearing of face masks will remain compulsory on public transport and in most indoor settings
Mark Drakeford said people arriving from England by train would be required to don a face covering as soon as they entered Wales.
The Welsh First Minister told BBC Breakfast he hoped people in England would observe the “clear” advice on face coverings given by Boris Johnson but that the practice would be a legal requirement in Wales.
“The people who run the transport system will make sure that people are aware that as they come into Wales different rules apply,” he told BBC Breakfast.
“If you travel into Wales by road now you will see signs that say ‘Welsh rules apply’. That will be true on trains and other forms of transport as well.
“I hope people will observe the clear advice of the prime minister in England, that they should continue to wear face coverings on public transport.
“Here in Wales the rule will be clear, it isn’t simply advice, it’s what the law will require.”
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