DNO Cubicles / Rail Power Distribution Enclosures

Manufactured from durable Glass Reinforced Plastic (GRP), mild or stainless steel, our DNO Cubicles can be supplied as standard or bespoke solutions to meet Network Rail and client requirements. Whether you’re delivering a signalling renewal, new station, level crossing upgrade or power infrastructure project, RSP provides complete design, build and testing services from our UK manufacturing facility.

Our DNO GRP cubicles are supplied in both single-phase 230V and 3 Phase 400V versions. All are designed for Class I and Class II Networks.

What is a DNO Cubicle?

A DNO Cubicle (Distribution Network Operator Cubicle) is an outdoor power distribution enclosure that houses incoming electrical supplies and associated equipment for railway infrastructure.

DNO Cubicles provide a secure interface between the electricity network and railway power systems, allowing power to be safely distributed to signalling equipment, level crossings, lighting, communications systems and other critical infrastructure.

Designed for long service life in exposed environments, DNO Cubicles protect electrical equipment from weather, vandalism and accidental damage while providing safe access for maintenance personnel.

Our DNO cubicles are manufactured and tested to meet Network Rail Specification BS EN 61439 and are available in GRP or stainless steel.  RSP can supply DNO cubicles in either double or single-sided enclosures, with multiple door options according to the customers meter reading requirements. 

Why Choose an RSP DNO Cubicle?

Choosing the right DNO Cubicle is about more than selecting an enclosure. It’s about working with a supplier that understands railway infrastructure and delivers practical engineering solutions.

At RSP, we combine decades of rail industry experience with UK manufacturing to provide DNO Cubicles that are built around the needs of your project.

When you choose RSP, you benefit from:

• UK design and manufacture
• Standard or fully bespoke cubicles
• Experienced rail engineering team
• Complete design, build and wiring service
• Factory Acceptance Testing (FAT)
• High-quality documentation
• Responsive technical support
• Reliable lead times
• Solutions designed specifically for railway applications

Features

Every railway project is different, which is why our DNO Cubicles can be configured to suit a wide range of operational requirements.

Built for the Railway Environment

Designed for long service life, our cubicles provide reliable protection in exposed trackside locations where durability and ease of maintenance are essential.

Bespoke Configurations

Internal layouts, compartment arrangements and equipment can all be tailored to meet your project specification.

Complete Turnkey Solution

From initial design through to manufacture, wiring, testing and delivery, we provide a complete service from one supplier.

Quality Manufacturing

Every cubicle is manufactured to a high standard and undergoes thorough inspection and testing before leaving our facility.

Typical options include:

• GRP construction
• Single or multi-compartment layouts
• Metering compartments
• Distribution boards
• Cable management systems
• Heating and ventilation
• Internal lighting
• Bespoke labelling
• Factory wiring
• Factory Acceptance Testing

Typical Applications

RSP DNO Cubicles are used across a wide variety of railway power distribution projects, including:

• Functional Supply Points (FSPs)
• Principal Supply Points (PSPs)
• Railway signalling power supplies
• Station infrastructure
• Platform lighting
• Level crossings
• Electrification & Plant (E&P) projects
• Communications systems
• Depot infrastructure
• Trackside compounds

Our engineering team works closely with customers to ensure every cubicle is designed to suit the operational and environmental requirements of each installation.

Why DNO Cubicles Matter

Reliable power distribution sits at the heart of every railway network. A well-designed DNO Cubicle does more than house electrical equipment—it helps protect critical infrastructure, improves safety for maintenance teams and supports the long-term reliability of the railway.

By designing each cubicle around the needs of the project, RSP helps customers reduce installation challenges, simplify maintenance and create power distribution solutions that are built to perform for many years.

Technical Specifications

Every project has its own requirements, so our DNO Cubicles are available in a range of configurations.

Available options include:

• GRP or alternative enclosure materials
• Single or double access doors
• Multiple compartment layouts
• Bespoke dimensions
• Internal equipment mounting
• Distribution boards
• Metering equipment
• Surge protection
• Ventilation systems
• Internal lighting
• Heating systems
• Client-specific locking arrangements
• Custom finishes and labelling

If your project requires a bespoke solution, our engineering team will work with you to develop a DNO Cubicle that meets your exact specification.

Frequently Asked Questions

What does DNO stand for?

DNO stands for Distribution Network Operator. These organisations own and operate the local electricity distribution network throughout the UK.

What is a DNO Cubicle used for?

A DNO Cubicle houses electrical distribution equipment used to safely supply power to railway infrastructure, including signalling systems, level crossings, lighting and communications equipment.

Can DNO Cubicles be customised?

Yes. RSP regularly designs bespoke DNO Cubicles to suit individual project requirements, including internal layouts, equipment, dimensions and cable arrangements.

Are your DNO Cubicles manufactured in the UK?

Yes. Every DNO Cubicle is designed and manufactured by RSP in the UK.

Do you provide complete turnkey solutions?

Yes. We offer a complete service including design, manufacture, internal fit-out, wiring, Factory Acceptance Testing (FAT) and delivery.

What environments are RSP DNO Cubicles designed for?

Our cubicles are designed for demanding railway environments where equipment must withstand exposure to the weather while providing reliable, long-term performance.

Product Support

All Distribution Cubicles a minimum 35-year life expectancy. RSP has an experienced team on hand to provide ongoing support pre, during and after-sales.

Speak to Our Engineering Team

Whether you’re replacing an existing installation or specifying equipment for a new railway project, RSP can provide a DNO Cubicle designed around your exact requirements.

Get in touch with our team to discuss your project, request technical advice or obtain a quotation. We’ll work with you to deliver a reliable railway power distribution solution that’s built to perform for years to come.