On 10 July, 00:06, "AJM" wrote:
Can some of you more knowledgeable people please explain in what
circumstance(s) would it be of benefit to add a travelcard to an Oyster
PAYG?

I always though that Oyster was valid throughout the London Underground
network and in all zones and that you are charged the minimum rate for
whichever journey you made. Is this not the case or am I missing something
somewhere?

Regards,

Clint

A travelcard is valid on National Rail. Pay As You Go (which I think
you mean by Oyster) is not valid on most of National Rail yet,
although there are some routes where it is.

If you want to travel on National Rail on a given day, it's probably
cheaper to have a travelcard than to use a combination of PAYG and
National Rail tickets, but you'd need to work it out for each case.

A travelcard season ticket can be added to an Oyster Card. If it's
valid for whole of the journey you are making, none of your PAYG
credit will be deducted.