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 June 1839; the London and Brighton Railway joined it on 12 July 1841, followed by the South Eastern Railway in 26 May 1842. It was soon found that the viaduct approaching London Bridge would be inadequate to deal with the traffic generated by four railways, so it was widened by the Greenwich Railway between 1840 and 1842, doubling the number of tracks to four. The new lines, intended for the Croydon, Brighton and South Eastern trains, were situated on the south side of the existing Greenwich line, whereas their station was to the north of the London Bridge site, leading