If a person has a Zonal Travelcard on paper or loaded on a TOC Smartcard, is it possible for the person to buy a zone extension ticket from a ticket machine at London Underground stations for Underground / DLR journeys?
For example: A zone 1-3 travelcard, with an intention to travel to Harrow-On-The-Hill on Metropolitan Line, which getting off at a zone 3 station seems not very feasible.
(I know that there are boundary zone tickets for NR journeys)
For example: A zone 1-3 travelcard, with an intention to travel to Harrow-On-The-Hill on Metropolitan Line, which getting off at a zone 3 station seems not very feasible.
(I know that there are boundary zone tickets for NR journeys)