Graham Construction has installed a new road bridge over a live railway in south London.
The structure was launched across 10 operational rail lines at Tennison Road, Norwood Junction, starting on Saturday 6 December 2014.
The project will replace an original bridge with a bigger structure which has wider footways and carriageways.
The original Tennison Road Bridge had spanned the main lines between London Bridge and East Croydon since 1922.
The new bridge was launched into position using a hydraulic strand jack system.
Network Rail’s scheme project manager, Shane O’Connor said: “By using technology and engineering expertise we were able to keep trains running and passengers travelling while we undertook what would otherwise have required a complete closure of the railway whilst the bridge was being launched”.
Rory McFadden, project manager for Graham, said: “Launching a 565 tonne bridge over 10 operational rail lines is quite a feat of engineering but the innovative methods used allowed for a controlled and safe installation. That said it took a lot of preparation in advance of the actual launch.”
Tennison Road Bridge is due to open for public use in Spring 2015.