No, the Eurail Pass does not cover the London Underground, commonly known as the Tube. Eurail and Interrail passes are specifically for the National Rail network in Great Britain, which connects different cities and towns. While you can use your pass on London's "Overground" trains and the Elizabeth Line (which are part of the National Rail network), the underground metro system, buses, and trams require separate payment via an Oyster card, contactless payment, or a standard paper ticket. However, having a Eurail Pass can still be beneficial for navigating London; many major London terminals (like Euston, King's Cross, and Paddington) are part of the National Rail system where your pass is valid for travel to destinations outside the city. For purely urban transit within London's zones 1-6, you will need to utilize the Transport for London (TfL) payment systems, as the Eurail barcode will not work at the Underground's electronic fare gates.