The Tunnel Boring Machine (TBM) is being assembled at a depth of 39 metres below ground level. Once completed, the machine will begin tunnelling from Sawli towards Vikhroli, forming an important underground stretch of the project

The portal beam—measuring 34 metres in length and with a cross-section of 5.5 metres by 4.5 metres—is among the heaviest structures ever installed over active tracks of Indian Railways