In a first, Delhi Metro finishes building twin tunnels.

Delhi Metro seems to be working overtime on Phase III as its 2016 deadline draws close. Recently , it announced completion of two tunnels on the Janakpuri (West)-Botanical Garden corridor. Two parallel tunnels at Dabri Mor were completed with help of two tunnel boring machines.

The two TBMs—named 'Riddhi' and 'Siddhi'—emerged at the Dabri Mor station after boring the two 1.2km long twin tunnels. While one of the TBMs was inserted in December last year, the other TBM had started work in January. These are the first tunnels to be completed on this corridor.

Delhi Metro Rail Corporation spokesperson Anuj Dayal said, 'This is the first occasion that twin tunnels have been completed together in any Metro project in India. The decision to go for a twin TBM breakthrough was taken since both TBMs were progressing almost simultaneously. The first such instance of a twin breakthough had happened during work on the 8.6km long Toronto-York Spadina subway extension in year 2002.'

ET