Yes, you can use a Eurail Pass in London, but it is primarily for national rail travel rather than city commuting. In 2026, your pass is valid on most National Rail services that operate out of London’s major terminals, such as those heading to Edinburgh, Manchester, or Oxford. However, a grounded peer tip: the Eurail Pass is not valid on the London Underground (the Tube), the London Overground, or the city’s red buses. You will need a separate Oyster card or a contactless payment method for those. For international travel, the pass is valid on the Eurostar departing from St. Pancras International, but you must book a mandatory seat reservation in advance and pay a separate fee (usually around €30 for Standard or €38 for Standard Premier). It is also valid on the Elizabeth Line for trips to Heathrow Airport, making it a convenient tool for arriving or departing the city, provided you understand it covers "trains" but not "transit."