This would be a smart card that can hold a credit balance and also season tickets, so it is not necessarily PAYG.
However, there are two types of such smart cards, Oyster cards issued by TfL, and ITSO cards issued by other train operating companies. Both can store season tickets for journeys within London. But only Oyster cards can be used for PAYG within London and only ITSO cards can be used for PAYG outside London and store season tickets involving journeys outside London.
Aside from that, QR codes are yet another form of ticket for National Rail trains, and they work in some stations in London and not others.
> Aside from that, QR codes are yet another form of ticket for National Rail trains, and they work in some stations in London and not others.
Which National Rail stations in London don't accept the barcoded tickets? I'm especially curious to know what happens if you attempt to purchase a barcoded ticket ('E-Ticket' in National Rail parlance) to one of these destinations.
The ticket machines at this station are also the same type as in non-National Rail stations, and they do not let you print pre-booked National Rail train tickets.
In my experience, if you try to book a National Rail ticket to West Ham, it will not offer you the option of a barcoded ticket.
> But only Oyster cards can be used for PAYG within London and only ITSO cards can be used for PAYG outside London and store season tickets involving journeys outside London.
This would be a smart card that can hold a credit balance and also season tickets, so it is not necessarily PAYG.
However, there are two types of such smart cards, Oyster cards issued by TfL, and ITSO cards issued by other train operating companies. Both can store season tickets for journeys within London. But only Oyster cards can be used for PAYG within London and only ITSO cards can be used for PAYG outside London and store season tickets involving journeys outside London.
Aside from that, QR codes are yet another form of ticket for National Rail trains, and they work in some stations in London and not others.