ABSTRACT
This is particularly relevant for cases where existing structures are of monumental and historical value.
Figure 1 shows the existing network of underground connections in Roma and the extensions currently under construction or at the design stage. At present, only two lines intersect each other at Termini Central Railway Station. Line B is relatively shallow as it was built during the 1930s mostly by cut-and-cover techniques, whereas the bored tunnels of Line A were constructed in the 1970s. A northward extension of Line B, connecting Piazza Bologna to Conca d’Oro, is currently under construction. Also under construction is the new Line C, whose preliminary design was approved by the Municipality of Roma in October 2002. Line C runs North West to South East of the city, for a total length of more than 25 km and 33 stations, reaching out to the eastern suburbs and coming to the surface at Giardinetti station. The easternmost part of the line (contracts T4 to T7) is presently under construction, while the central part of the route (contracts T2 and T3) is currently at the detailed design stage.
