Kolkata Metro created history on Wednesday when its rake ran through a tunnel under a river for the first time in the country, a senior official said here.
The Metro rake which had only officials and engineers on board ran under the Hooghly from Kolkata to Howrah on the other side of the river.
This is a “revolutionary step” in providing a modern transport system to the people of Kolkata and its suburbs, the official said.
Metro Railway General Manager P Uday Kumar Reddy travelled from Mahakaran station in Kolkata to Howrah Maidan station of the East West Metro corridor in the rake.
Later, another rake also reached Howrah Maidan station by the same route.
After this stretch becomes operational, Howrah Maidan will be the deepest Metro station - 33-metre below the surface - of the country.
The Metro is expected to cover the 520-metre stretch under the river Hooghly in 45 seconds, he said, adding that this tunnel under the river is 32 metres below the water surface level.