Bulgaria
Metro Construction in Sofia
Metro construction in Sofia is being expanded by means of the new Line 2; a 17 km long route is planned from the Obelya Terminal for Line 1 via Nadejda, the Central Station and the National Art Palace. On the part section from Nadejda Junction to Sveta Nadelia Square rail tracks, an historic church and a built-up area have to be undertunnelled in part with only 3 m overburden over 3.8 km without settlements and lifts. In April 2010 an EPB shield (Herrenknecht AG, Schwanau/D; S-525) with 9.36 m cutter wheel diameter and 3,200 kW output began to drive the 3,770 m long route. G.B.
