OSL Global is an authorised IRSE assessing agency supporting signalling professionals and organisations with competence management and licensing assessments.

If you are planning infrastructure works that require a licensed Principal Contractor, OSL provides multidisciplinary engineering and delivery support across signalling, telecoms, electrification and plant.

OSL delivers comprehensive signalling services with experience across a wide range of railway control systems and technologies.

For OSL, turnkey delivery means providing a coordinated framework that integrates design, installation management, testing and commercial control under one accountable structure.

Principles Testing is a structured verification process used within rail signalling projects to confirm that signalling logic, control tables and system data align with approved design intent and operational principles.

Monitoring how digital technologies are evolving across rail and infrastructure, ensuring our engineering approach, systems thinking and assurance processes remain aligned with the future direction of the industry.

OSL have developed bespoke 3D-modelled sealing caps to prevent tampering with BR930 relays and SSI interlocking modules, reinforcing safety through thoughtful engineering detail.

Multidisciplinary rail engineering partners play a critical role in managing complexity, reducing risk, and supporting the safe, efficient delivery of projects across the network.

Rail signalling design defines how trains are safely detected and controlled across the network. An overview of the discipline and how OSL supports signalling projects through design, testing and commissioning.

Electrification systems operate as part of a wider railway ecosystem. They interface continuously with signalling systems, depot operations, passenger facilities and monitoring platforms.

Functionally Equivalent (FE) Design is a structured approach used within rail signalling renewals where life-expired assets require replacement without altering the operational principles of the railway.

Reaching the 60% IDC milestone for the Beckton Depot Southern Expansion Concept Design. A collaborative, multidisciplinary approach.