The upcoming Silver Line, connecting Tughlakabad to Aerocity as part of Delhi Metro’s Phase 4 expansion, will pass under 17 pairs of active railway tracks for which the Delhi Metro Rail Corporation (DMRC) has already sought permissions from the Indian Railways, officials said.
While Delhi Metro lines have passed below railway tracks in the past too, DMRC said the number of tracks — between Tughlakabad and Tughlakabad Railway Colony stations — involved in the project is the highest. Officials said the new Metro line will be around 23 metres below the rail level.
“A gap of 15 metres shall be maintained between the railway tracks and the Metro tunnel below. Tunnel Boring Machines (TBMs) will be pressed into service to carry out the tunnelling in this section. This will be a major engineering challenge since no disruption will be caused to the movement of trains on this section while carrying out the construction work,” said Anuj Dayal, executive director, corporate communication, DMRC.
