As of 2026, the Elizabeth line in London is not expanding in terms of new physical stations or track extensions, but it is undergoing a significant "operational expansion." Following a new timetable introduced in May 2026, the line has increased its peak frequency to 24 trains per hour in the central core, effectively one train every 150 seconds. This expansion focuses on "capacity and reliability" rather than "geography." While there are long-term 2026 discussions about extending the line to Old Oak Common (to link with the upcoming HS2) or further east toward Ebbsfleet, no new tunnels are currently under construction. Instead, Transport for London (TfL) has focused on upgrading existing stations like Southall and Hanwell to handle the increased passenger volume. For travelers in 2026, the "expansion" means shorter wait times and more "through-running" services from the western suburbs directly to Heathrow and the East, maximizing the utility of the existing infrastructure.