Mumbai, April 12 -- The assembly of the second tunnel boring machine has commenced at Sawli (near Ghansoli) in Mumbai at a depth of 39 meters below ground as part of the work for Mumbai-Ahmedabad High Speed Rail, officials said. This TBM (tunnel boring machine) will begin its journey from Sawli towards Vikhroli.

The gantry, weighing 190 metric tons, having a length of 18 meters, 10 meters in width and 9 meters in height was lowered on Saturday.

There are four gantries in both the TBMs, which will be attached to the main shield assembly and utterhead.

The gantries will travel the complete excavated length while supporting the critical operations such as excavation, waterproofing, tunnel lining segment installation, officials said.

Due ...