At White City in west London, the Hammersmith and City line runs on a high-level brick arch viaduct that crosses over both Wood Lane and the eastbound Central line. As part of the White City development, a section of this viaduct was removed and replaced with a new twin-track highly skewed bridge. This comprised a halfthrough bridge formed from three principal steel girders with connecting cross-beams and concrete infill. The deck was built off line, then slid into position during a four-day possession of the Hammersmith and City line, requiring part of the existing viaduct to be demolished; the Central line below remained open throughout. The piled substructure was constructed within the constraints of the existing viaduct arches. The existing early 1930s steel bridge deck over Wood Lane was strengthened in advance to provide new bearing positions. During the possession it was truncated by 2 m and supported on new piers.
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