The groundbreaking ceremony for this phase took place on 7 September 1983 on Pottendsdorfer Street at the Philadelphia Bridge and after six years, the central section of the U6 between Philadelphia Bridge and Heligenstadt/Friedensbrücke went into operation.
Upacara peletakan batu pertama dilakukan pada 7 September 1983 di Jalan Pottendsdorfer di Jembatan Philadelphia dan setelah 6 tahun, bagian tengah dari U6 antara Jembatan Philadelphia dan Heligenstadt/Friedensbrücke mulai beroperasi.