Overview

• A 91-metre tunnel boring machine completed a 0.792-km passage at Tughlakabad Railway Colony station to form the second of two parallel tunnels on the Golden Line
• Construction crews installed 559 precast concrete rings cast at a mechanised yard in Mundka and cured them with steam to achieve early strength
• The tunnel was excavated at an average depth of 18 metres using the earth pressure balancing method to maintain face stability under dense urban areas
• Sensitive instruments fixed to nearby structures tracked ground movement in real time and confirmed zero settlement beneath existing buildings
• The breakthrough advances Phase IV’s plan to add over 40 km of underground track, accelerating the Aerocity–Tughlakabad corridor toward operational readiness