As of 2026, the Elizabeth line is officially the busiest railway in the United Kingdom. Since its full integration and the opening of the central section, it has seen a staggering volume of traffic, with over 600 million passenger journeys recorded in its first three years of operation. In the 2024–2025 financial year alone, it propelled London Liverpool Street to the top spot as Britain’s busiest railway station, handling approximately 98 million entries and exits. The Elizabeth line's high-frequency service and cross-London connectivity have made it the backbone of the capital's transit system, frequently carrying more passengers per day than several other major UK rail networks combined. Other historically busy lines include the South West Main Line (terminating at London Waterloo) and the West Coast Main Line, but the Elizabeth line’s modern "metro-style" capacity has set a new benchmark for British rail travel, often operating with nearly 100% capacity during peak rush hours.