Yes, the Elizabeth line is open on Sundays in 2026, providing a critical east-west link across London. However, Sunday service often includes planned maintenance windows that may affect specific branches. For example, during the spring of 2026, there are scheduled partial closures between Abbey Wood and Paddington on certain Sunday mornings to allow for signaling upgrades. On a standard Sunday, trains typically run every 5 to 10 minutes through the central section (Paddington to Whitechapel) and slightly less frequently on the Shenfield and Reading/Heathrow branches. It is always recommended to check the TfL (Transport for London) Go app or the "Status Updates" webpage on Saturday evening, as Sunday is the primary day for engineering works that can result in bus replacement services for portions of the line.