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I assume that you have purchased a single/return train ticket to London and has opted to have a travel card included. Firstly London is divided up into 9 zones starting with Zone 1 for central London out to Zone 9 for the furthest suburbs. You can use it to make unlimited number of journeys/changes on:
Tube, DLR, London Overground - Anywhere within the Zones on your Travelcard.
National Rail - Anywhere within the Zones on your Travelcard except on Eurostar, South Eastern High Speed rail link from St Pancres, Heathrow Express and Heathrow Connect between Hays & Harlington and Heathrow Airport.
Buses - All London Buses including 24 hour buses, Night Buses and the two Routemaster bus routes,regardless of what zones you have (not valid on the private tour buses).
Croydon Tram Link - providing you have a travel card that includes zone/s 3,4,5 and/or 6
Your travel card is valid up until 4:30 am the day after the expiry date shown on it.This means that you can still use it on 24 hour/night buses after midnight on the expiry date shown.