Travelcard
The Travelcard is an inter-modal travel ticket for unlimited use on the London Underground , London Overground , TfL Rail , Docklands Light Railway , Tramlink , London Buses and National Rail services in the Greater London area . 
<triplet> London Underground <subj> Greater London <obj> located in the administrative territorial entity <triplet> London Overground <subj> Greater London <obj> located in the administrative territorial entity <triplet> Docklands Light Railway <subj> Greater London <obj> located in the administrative territorial entity <triplet> London Buses <subj> Greater London <obj> operating area