cng

In significant step towards adopting green fuel, the railways have launched their first CNG train. Railway minister Suresh Prabhu flagged off the train, run on dual fuel system — diesel and CNG — on the Rewari-Rohtak section of northern zone.
The passenger train would consume over 20% of CNG, covering a distance of 81km in about two hours.
The move is not only a significant step towards reducing the carbon footprint of the railways, but it will also provide capacity to use a cheaper alternative fuel source in future.

Source: http://timesofindia.indiatimes.com/india/Railways-starts-first-train-that-chugs-on-CNG/articleshow/45892086.cms