A vital piece of Peak District railway infrastructure is set to receive a major upgrade this summer, as Network Rail announces a £7.5 million investment into one of Chapel Milton's iconic twin Victorian viaducts.

The 160-year-old, 15-arch structure plays a critical role in the UK's freight network, carrying up to 25,000 tonnes of stone, cement, and limestone daily from four major Derbyshire quarries to construction projects across Britain, including HS2 and major road developments.

To secure the viaduct's long-term future and ensure the continued safe and reliable movement of freight, a comprehensive programme of engineering works will be carried out between now and autumn. These include:

• Filling voids across each span to strengthen the structure

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• Repairing brickwork

• Reinforcing parapets (bridge walls)

• Installing new waterproofing and drainage systems

• Adding handrails and guardrails for worker safety

• Replacing and realigning the railway track

The work will require a full closure of the Great Rocks freight line from 29 August to 7 September 2025. During this nine-day period, the track over the viaduct will be removed to allow for critical upgrades before being reinstated. The project is being delivered by contractor AmcoGiffen.

David Hunter, Network Rail's senior freight manager for the North West and Central region, said: "Chapel Milton viaduct is the only route allowing freight services to transport aggregate from four major Derbyshire quarries to serve the construction sector.

"It is a Grade II listed Victorian structure and requires a modern touch to make sure freight trains can pass over it safely and efficiently for generations to come.

"Around 25,000 tonnes of material is transported across the viaduct every day. Each train takes about 76 wagons off the roads. The longevity of the viaduct is essential to the success of the economy and reducing the carbon footprint of the construction sector."

Preparation work is already underway in the area, with engineers setting the stage for the main upgrade. Local residents are invited to learn more at a community information event on Wednesday 18 June, from 4–7pm at Chinley Chapel, where members of the project team will be available to answer questions and discuss the upcoming work.