London Waterloo is Britain's largest and busiest station by floor area and passenger volume.
Main station: Terminal platforms (1–16) under vast arched roof (1922 reconstruction). Former Eurostar platforms (20–24) now domestic. Concourse spans full width, linking Underground (Bakerloo, Jubilee, Northern, W&C), retail (200+ units), and Network Rail offices.
Larger than Victoria, Liverpool Street, King's Cross. Only Paris Gare du Nord and Tokyo Shinjuku exceed its throughput globally.