Compromised Overlap Mitigation

Client: Infraco SSL
Duration: 2000-2004
Value: £8m

Project Overview
The Compromised Overlap Project consisted of the design and implementation of Signal Modifications at 33 District line signals, and the QRA (Quantitative Risk Analysis) of other Metronet Rail Sub Surface line network. The project involved the mitigation of compromised overlaps by a combination of signal modifications to reduce safety related operational risks. This these works comprised 4 work streams:

• District line mitigations
• Wimbledon branch mitigations
• Remaining sub–surface lines analysis
• Configuration management (risk mapping) .

CPC’s Role
CPC’s initial role as on this project was produce and implement a project recovery strategy to bring the project back in line with its original budget and programme. Following the initial period of recovery, CPC continued as Project Managers taking responsibility for the management, co-ordination and delivery of the 4 work streams (on behalf of Metronet Rail SSL). The political profile of this Government Taskforce project often meant that CPC to responsibility for liasing with London Underground Limited’s (LUL) stakeholder representatives, to ensure that their requirements were continually being met.

Client Benefits
CPC’s knowledge and experience of working with Infrastructure companies allowed them to quickly mobilise their recovery strategy and ultimately recover the project’s status. CPC’s understanding of the Underground environment also made it possible for the Compromised Overlaps Mitigations project to be delivered with the assurance that LUL could continue to comply with its statutory obligation, to operate safe passenger services, as each signal modification was brought into service. The project as a whole enabled compliance with the Health & Safety Executive’s safe operating requirements by further reducing the safety risk posed by compromised overlaps on the Sub – Surface lines network - District line.