Review of Network Rail / Crossrail Boundary

Network Rail (NR)

Review of Network Rail / Crossrail Boundary

Crossrail represents a £16bn investment in London’s transportation network, providing an essential east-west link through central London.

CPC Role

CPC Systems was engaged to undertake a structured review of the systems and key East and West signalling boundary interfaces proposed for implementation. CPC provided an initial assessment of the boundaries' relative complexities and key risks, along with suitable mitigations, whilst also noting other possible interface issues. The responsibilities of each organisation were also identified, including for those activities recommended as part of risk mitigation.

Commission Delivery

The CPC team spent time becoming familiar with the stakeholders and their respective responsibilities for delivery of the interface in order to fully assess the current status of the project. This was followed by clarification meetings with individual stakeholders to better understand individual interpretation of responsibilities, alongside projected timelines for delivery, a process that identified opportunities to realign the approach of some of the interfacing teams.

For each interface a structured scenario-based review was undertaken of how it would operate under normal operation (i.e. non-degraded modes). The projected service patterns and associated projected available capacity were assessed to understand compliance with the project goals, leading to key constraints being identified.

Unique Added Value

By drawing upon extensive experience of the commissioning and service operation of complex technical interfaces and signalling protection system migration boundaries, CPC Systems provided an insight into how best to mitigate risks associated with the operational and technical interfaces. Examples of this included defining responsibilities for technical scope and interfaces during migration stages from the legacy system to the new system and a structured methodology for undertaking ‘Day In the Life Of’ structured reviews of normal, abnormal and degraded operation.

Commission Results

CPC’s findings were presented to the client and stakeholders with clear identification of project risks and associated mitigating actions.

In addition, CPC produced a lessons-learned section documenting pitfalls experienced previously during implementation of complex interfaces and provided further guidance on how to successfully progress design and management of the interface based on this experience.

Project Overview


Systems management


Transport & Infrastructure