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Copenhagen Metro
Copenhagen Metro

Press release -

Copenhagen Metro Line 4 Southern extension opens to revenue service

The M4 metro line to Sydhavn and Valby, supported by Hitachi Rail’s cutting edge digital signalling, was today inaugurated by His Majesty Frederik King of Denmark accompanied by the Danish Minister of Transport, ambassadors from France, Austria, Italy, Portugal and Japan as well as the Lord Mayor of Copenhagen and the mayor of Frederiksberg.

The M4 South extension is a 4.5 km long metro line that serves five metro stations and a hub for interconnections with the S-train network and regional and national trains. The new metro line connects the traffic hub Copenhagen South with the city centre and the northern part of the city. Along the way it connects with M3 Cityringen on a number of stations and passes Kongens Nytorv, where all four metro lines meet.

Within the M4 South and North extensions, Hitachi Rail designed and supplied the Transportation System including signalling technologies and train supervision as well as the new train fleets.

The system designed by Hitachi Rail combines driverless and communication-based train control (CBTC) technology. The technology reduces the need for physical wayside infrastructure and increases service capacity, enabling trains to run safely at shorter intervals.

With the new south extension of the M4 line, about 75% of citizens in the Copenhagen and Frederiksberg areas will have immediate access to a metro or train station (less than 600 meters).

M4 is the fourth metro project successfully completed by Hitachi Rail in Copenhagen, starting with M1 and M2 opened in commercial service in 2002, followed by M3 (Cityringen) which was inaugurated in September 2019.

Since then, Hitachi Rail has supported Metroselskabet and the municipality’s goal of connecting Copenhagen 24 hours a day, 7 days a week with its innovative design and most advanced signalling technologies, developing greener and more sustainable mobility.

Gianluca Guido - Head of Hitachi Rail Denmark, said: We are grateful to Metroselskabet and the transport authorities for their trust and strong collaboration over the past years and we are proud to share the success of this key step towards the ambitious plan of the Copenhagen city to become the first carbon-neutral capital.”

Hitachi Rail has been present in Denmark for over 30 years through its key partnership with the Copenhagen Metro. On 31 May 2024, Hitachi Rail completed the acquisition of Thales’ Ground Transportation Systems business in a €1.7bn deal, which has seen it expand its presence in Denmark including through its strong collaboration with BaneDanmark for the roll out of ERTMS digital signalling technology on the country’s main line network.


For official images form the inauguration event, please see


About Hitachi Rail

Hitachi Rail is committed to driving the sustainable mobility transition and has a clear focus on partnering with customers to rethink mobility. Its mission is to help every passenger, customer and community enjoy the benefits of more connected, seamless and sustainable transport.

With revenues of over €7bn and 24,000 employees across more than 50 countries, Hitachi Rail is a trusted partner to the world’s best transport organisations. The company's reach is global, but the business is local - with success built on developing local talent and investing in people and communities. 

Its international capabilities and expertise span every part of the urban, mainline and freight rail ecosystems – from high quality manufacturing and maintenance of rolling stock to secure digital signalling, smart operations and payment systems.

Hitachi Rail, famous for Japan's iconic high speed bullet train, draws on the digital and AI expertise of Hitachi Group companies to accelerate innovation and develop new technologies. Hitachi Group is present in 140 countries with over 270,000 employees and global revenues of €54.55bn / ¥8,564 bn.

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Ed Brown

Ed Brown

Global Media Relations +44 7850 071287
Nadia Alves-Pires

Nadia Alves-Pires

Media contact - Nordics & Northern Europe

Welcome to Hitachi Rail

Hitachi Rail is a fully integrated, global provider of rail solutions with international capabilities that spans every part of the urban, mainline and freight rail ecosystems – from high quality manufacturing and maintenance of rolling stock to secure digital signalling, smart operations and payment systems.

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