Protecting Signalling Assets Through Innovation

At OSL Global, continuous improvement in safety and security across signalling systems is a core focus of our engineering work.

One recent challenge involved protecting BR930 plug-in relays and SSI interlocking module pods from inadvertent or malicious interference while in service. These components are critical to safe railway operation, yet existing protection methods left scope for unauthorised access on site.

To address this, OSL designed and developed bespoke, 3D-modelled sealing caps, engineered specifically for this application. The solution was designed to:

• Prevent on-site tampering by covering internal fixing nuts

• Secure relay casings until legitimate servicing or repurposing is required

• Achieve a precise fit, making removal impossible without deliberate breakage

As no standard CAD details or off-the-shelf solutions existed, our engineering team developed the design entirely from first principles. This ensured an optimal seal that enhances physical security while remaining practical for maintenance and asset management.

In railway signalling, small design details can have a significant impact. This innovation is a simple but effective example of how targeted engineering solutions help safeguard critical infrastructure and support the safe operation of the network.

Need support with signalling, systems or wider rail engineering delivery? Get in touch.