Millennium Bridge, London people walking caused small sideways oscillations in the bridge, which in turn caused people on the bridge to sway in step, increasing the amplitude of the bridge oscillations and continually reinforcing the effect. On the day of opening, the bridge was crossed by 90,000 people, with up to 2,000 on the bridge at any one time. Resonant vibrational modes due to vertical loads (such as trains, traffic, pedestrians) and wind loads are well understood in bridge design. In the case of the Millennium Bridge, because the lateral motion caused the pedestrians loading the bridge to directly participate with the bridge,
London Bridge station British Parliament decided that the London and Greenwich line should become the entry corridor into London from South East England. The two railways were therefore required to share the route of the London and Croydon Railway from near Norwood (which in turn shared the route of the London and Greenwich Railway from Bermondsey to London Bridge). As a result, in 1838 the London and Croydon Railway obtained powers to enlarge the station it was then constructing at London Bridge, before it had opened for traffic. The London and Croydon Railway opened its line and began using its station on 5