As part of the programme to replace the outdated rolling stock on London Underground’s District Line, it was necessary to modify the existing signalling system in order to make it compatible with the new air conditioned S type trains which are not only longer than previous trains, but have different operating characteristics. In order to make the signalling changes, the project was split into 10 separate sections. The Legacy project OS10 involved the works over approximately 7 miles of railway between Whitechapel and Barking in East London.
VGC was engaged by London Underground’s signalling contractor Invensys to undertake the signalling changes required for the new rolling stock and the contract encompassed concept design, installation and delivery. Taking account of signal sighting considerations, VGC’s scope included changing signal positions which involved the provision of new foundations and support structures. Other work involved new cable routes, alterations to signage, and trackwork design modifications. In undertaking any signalling modifications, strict procedures were followed in order to maintain the integrity of the system.
At October 2011 VGC has successfully completed Sections 1, 3 and 5 and is on track to complete works on schedule in February 2012. This contract demonstrated VGC’s capability of successfully undertaking signalling works on key strategic transport networks. VGC operates safety, quality, environmental and competency management procedures approved by London Underground and holds a principal contractor’s licence for operating on its infrastructure.