Metroprojekt, the Prague architecture firm, has come up with a cheaper variant of Pragueâs fourth metro line which would replace the original D-line project thatâs now on hold because of a lack of funds in city coffers. The new idea is to replace it with a branch of the existing C-line, thereby cutting costs by CZK 10bn. The first phase would connect the PankrĂĄc station with NovĂ© Dvory and KrÄ, and continue on to PĂsnice in later phases. Prague mayor Bohuslav Svoboda says the project will have to be discussed first by city officials and that construction could only begin after the current extension to the A line (in the direction of the airport in Prague 6) is completed in 2014.