HS2 has celebrated a step forward in a "key part" of the project in Warwickshire.

Engineers have completed the construction of four parallel viaduct decks at Delta junction.

The viaducts stretch over 600 metres around the River Cole near the M42 and M6.

HS2 likened the viaducts to Spaghetti Junction; the Delta is formed of a series of interconnected viaducts, flyovers and underpasses, taking the high-speed line over motorways, local roads, railways, rivers and floodplains.

Two parallel viaduct spans will carry the four-track mainline running north and south, while two narrower viaducts on either side will carry services to and from the new Birmingham Curzon Street station in the city centre.

Caroline Warrington, HS2 Ltd's head of delivery, said: "HS2 will transform journeys between our two largest cities, while freeing up space on the existing West Coast Main Line for more freight and local services.

"The Delta forms a key part of the project and it's great to see it starting to come together. I'd like to thank everyone involved in the Coleshill viaducts and look forward to seeing more progress in the year ahead, as the focus turns to completing the robust kerbs and parapets." 

The construction of the viaducts – which stretch for a combined total of 2.4km – is being delivered by HS2's main works contractor in the Midlands, Balfour Beatty VINCI.

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The decks are made of 1,024 individual concrete segments which were manufactured off-site at a purpose-built facility a few miles away at Kingsbury.

These were then moved to site before being lifted and secured into position to form the spans of the viaducts.

The central 22m wide deck consists of two rows of 11m wide segments, each weighing 60 tonnes, while the two single track viaducts are made of single rows of smaller, 44 tonne segments. They are supported by 54 reinforced concrete piers, each up to 12m high.