Yes, the Elizabeth line generally operates a full seven-day service across its entire route from Reading/Heathrow in the west to Abbey Wood/Shenfield in the east. However, like all major London rail lines, it is subject to planned engineering works on weekends. On specific Sundays, you might find that the central section (Paddington to Abbey Wood) starts later in the morning (often around 10:00 AM or 11:00 AM) or that certain branches are replaced by rail-replacement buses to allow for track and signaling maintenance. As of February 2026, TfL has been performing routine maintenance that occasionally affects Sunday morning start times. It is highly recommended to check the TfL "Plan a Journey" tool or the "Status Updates" page on the day you intend to travel to ensure there are no specific closures affecting your chosen segment of the line.