With offices across the UK and India we work on some of the most demanding and challenging railway projects, safely, on time and on budget.


Design. Install. Test. Commission.


OSL are one of the leading independent signalling design & testing companies, offering whole system rail infrastructure and signalling solutions. OSL have a wealth of industry experience including:

  • Signalling
  • Electrification
  • Low Voltage Systems
  • S&C
  • Telecommunications
  • Civil Engineering
  • Permanent Way


Introducing a transformational change to how infrastructure projects are delivered. With a wide range of 3D and BIM services, OSL assess traditional workflows and implement BIM in accordance with BS1192 & PAS 1192 standards.

Electrification & Plant

Electrification and plant keeps power flowing and trains moving. With resources situated nationwide, OSL currently undertake E&P design works and the management of installations and testing.

  • Electrical
  • Mechanical
  • Civil
  • Structural
  • BIM, 2D & 3D CAD
  • Permanent Way


Crewe Engineering & Design UTC offers rewarding and inspiring education for 14-18 year olds seeking a pathway to employment. The UTC is led by a core group of employers including OSL, Bentley, Jacobs, Siemens and Network Rail.

  • Work experience
  • Apprenticeships
  • Placements
  • Engineering the future

Overhead Line Equipment

OSL currently undertake OLE design works and management. This includes associated E&P works in support of OLE such as HV substations, cable routing, cable containment, testing and commissioning of power supplies.

  • 360 Survey works
  • Design
  • Installation & Testing


OSL’s Systems Engineering sector was established to provide Railway signalling systems technical and project delivery support and consultancy services to clients in the UK and internationally.

  • Electronic Signalling Systems Testing and Commissioning (T&C) Management including Systems TIC
  • Electronic Signalling Systems Testing
  • System Consultancy
  • Systems Integration
  • Systems Installation.

Optimised engineering based on experience and expertise.

Level crossings are one of our core strengths with one of the most experienced design teams in the country. With over 30 produced, covering everything from simple relay driven AHB’s to PLC based MCB-OD’s. We can also provide CCTV control solutions for use worked crossings. This wide skills base has earned us the title of 'Delivery Partner of Choice.'