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title: Mk3 Colour Light Signal
description: "Unipart Dorman’s Mk3 Colour Light Signal (CLS) has achieved full Network Rail Product Acceptance and is now readily available for new and existing installations.
Unipart Dorman, a leading designer and manufacturer of innovative rail and traffic management products, has announced its Mk3 Colour Light Signal (CLS). It is now fully integrated into Unipart Dorman’s manufacturing and test facility at Southport after receiving full product acceptance from Network Rail in summer 2025."
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# Visit us at Cenex 2024 - The Future of Mobility
[ our solutions ](https://updates.unipart.com/mk3cls#solutions)
[ enquire ](https://updates.unipart.com/mk3cls#enquire)
Unipart Dorman Mk3 signal delivers superior anti-phantom performance, "Plug & Play" installation, and a maintenance-free, retrofittable design.
The Unipart Dorman CLS Mk3 signal is a high-performance, maintenance-free signalling solution designed to enhance safety, efficiency, and long-term value for the UK rail industry. It is fully compliant with Network Rail specifications and is retrofittable into existing Unipart Dorman housings, providing a seamless upgrade for current infrastructure.
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### **Prioritising signalling safety**
Worried about false signals and trackside safety risks?
Enhance signalling safety with the Unipart Dorman Mk3 Colour Light Signal (CLS). This latest iteration of the CLS family features advanced optics and a ground breaking anti-phantom top yellow module. This results in a superior anti-phantom design that delivers a 98% improvement in anti-phantom performance, significantly reducing the risk of false signals and improving driver readability.
Delivering improved worker safety is at the heart of all product innovations from Unipart Dorman, the Mk3 CLS continues to prioritise safety through its innovative design, and when installed with the Assisted Lift Trunnion removes any requirement to work at height during installation. Resulting in dramatically maximising worker trackside safety.
[ get in touch ](https://updates.unipart.com/mk3cls#enquire)
### Looking to reduce installation time and cut maintenance costs?
By utilising the Mk3 CLS, you will benefit from significant efficiency gains.
The Plug and Play - MIL 5015 Plug Coupler connections means installation with our Assisted Lift Trunnion (ALT / HDALT) is faster and safer, resulting in installation times being drastically reduced, from approximately 70 total man hours for iLS Installation to just 7 hours, and requiring only 5 workers rather than 10.
The Mk3 CLS is designed to be maintenance free, developed on the success of over 40 million fault free operational hours for GPLs and a long LED lifespan and modular design. This leads to reduced maintenance frequency, quicker replacements, and supports an "install and forget" approach.
Experience competitive lifecycle costs and reduced spares. The Mk3 CLS delivers demonstrable savings.
[ get in touch ](https://updates.unipart.com/mk3cls#enquire)
### Seamless upgrades & operational flexibility
Upgrading your signalling infrastructure doesn't have to mean major civil works. The Mk3 CLS is fully retrofittable into all existing Unipart Dorman housings, meaning no need for infrastructural changes and offering hassle free renewals.
The Mk3 CLS delivers a versatile signalling solution, with voltage options of 110V & 24V ensuring different infrastructure needs are met. The improved universal close up viewing solution provides clear visibility from all positions and will reduce stock complexity as it's a single universal module.
When used in conjunction with the Assisted Lift Trunnion (ALT), this signal installation and ongoing management is greatly simplified. It is fully compliant with Network Rail specifications.
[ get in touch ](https://updates.unipart.com/mk3cls#enquire)
## Signalling product spotlights
In addition to the innovation of the CLS MK3, Unipart Dorman offers a comprehensive portfolio of signalling solutions designed to improve network performance and reduce costs. Learn more about some of our other signalling related innovations:
#### ALT & HD ALT
This innovative system enhances worker safety and reduces installation time by significantly lowering the force required to raise and lower signals, making it ideal for both new and existing infrastructure.
[ learn more ](https://www.unipartdorman.co.uk/lightweight-signalling/)
.png "LX PLUS (2)")
#### LX Plus
A complete, off-site build and test solution for level crossings that can be manufactured, tested, and stored before being delivered as a single package, reducing on-site time and costs by 20%.
[ learn more ](https://updates.unipart.com/lx-plus?hsLang=en)
#### Pre-Wired RTL
A cost-effective solution delivered as a post-mounted unit to minimise on-site installation, alignment, and testing time. It utilises "plug couplers" to simplify connections and reduce the need for work at height.
[ learn more ](https://www.unipartdorman.co.uk/level-crossings/)
.png "Wayside Signalling (3)")
#### Wayside Signalling
A range of LED signals designed for the North American market that can integrate with existing housing styles, offering a long and predictable life for railway operators.
[ learn more ](https://www.unipartdorman.co.uk/wayside-signalling/)
## Get in touch
**How the process works**
**Step 1: Complete the form**
Fill out the proposal form above to submit your ideas.
**Step 2: We receive your idea**
As soon as you fill the form in we will receive your idea.
**Step 3: We review your idea**
Our experienced and multi-skilled team will review your idea.
**Step 4: We'll get in touch**
We will get in touch to provide feedback and a decision on taking the idea further with Unipart Rail.