No, you cannot use a Eurail (or Interrail) Pass for travel on the Elizabeth line in London. The Elizabeth line is part of the Transport for London (TfL) network, which operates differently from the national rail services covered by Eurail. While it runs on tracks shared with National Rail in certain sections, it is treated as a suburban "metro-style" service. To ride the Elizabeth line, you must use a contactless payment method, an Oyster card, or a standard National Rail ticket. It is a common point of confusion because many other "National Rail" services in the UK are covered by Eurail, but TfL-managed services (including the London Underground and most Overground routes) are excluded. If you are using your Eurail Pass to travel from Heathrow into central London, you should take the Heathrow Express, which is included in the pass and offers a high-speed, direct connection to Paddington Station, whereas the Elizabeth line would require a separate fare.