No, the Interrail (and Eurail) pass does not include travel on the London Underground, commonly known as "the Tube." The pass is designed for use on National Rail services (mainline trains) across the United Kingdom and Europe. However, there are some exceptions within London: you can use your Interrail pass on the London Overground and the Elizabeth Line, as these are considered part of the national rail network. For the standard Tube lines (like the Central, Victoria, or Piccadilly lines) and the Docklands Light Railway (DLR), you must pay separately using a contactless card, Oyster card, or mobile payment. Additionally, the pass is not valid on the Heathrow Express, though it is accepted on the slower Elizabeth Line service to the airport. In most other European cities, the pass similarly excludes local metros and trams unless they are specifically operated by the national railway.