Which Metro system is the world's first completely green Metro system?
- A.Hong Kong Mass Transit Railway
- B.Singapore Mass Rapid Transit
- C.Delhi Metro Rail Corporation
- D.London Underground
Show answer
Correct answer: C. Delhi Metro Rail Corporation
Explanation
The correct answer is C, the Delhi Metro Rail Corporation. The Delhi Metro was the first metro and rail based system in the world to be certified by the United Nations for earning carbon credits, because its regenerative braking returns electricity to the grid each time a train slows. It also built solar plants at its stations and depots and uses rainwater harvesting and green buildings, which is why it is described as the first completely green metro.
Option A, the Hong Kong Mass Transit Railway, and option B, the Singapore Mass Rapid Transit, are both older and efficient systems but did not take the carbon credit route first. Option D, the London Underground, opened in 1863 and is the oldest underground railway in the world, which makes it the natural trap for a candidate who reads first as oldest. The Delhi Metro Rail Corporation itself was set up in 1995 and its first stretch opened in December 2002.