The line would create a through connection between two of the city’s three main stations, and almost double capacity across the Danube. 

The study will investigate whether an underground link between the eastern and western parts of the capital city is viable, what route it would take, where any stops along the line should be located, what technology should be used, and what impact the project will have on the network. 

Főmterv, Hungary, will be responsible for planning the infrastructure and coordinating the study. SMA & Partner, Switzerland, will develop a new timetable structure and the necessary modelling, while UNStudio, the Netherlands, will work with its Hungarian partners to undertake the urban planning and architectural design tasks. 

A decision on whether to proceed with the project will follow the completion of the feasibility study, which will determine if the benefits outweigh the costs. The project is expected to take decades to complete. 

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