Can someone tell me if you can touch in/out with PAYG on the pink
route validators on the Overground platforms (there is both a sign
above them for touching in/out) or do you have to touch in on the
central line and then go over and touch the route validator if you
want to use the overground?

Also if you are using the Overground between Stratford and H&I do you
have to touch the route validators at both ends.

Thanks