The biggest invention of human history is wheel. If we have to progress the wheelhas to keep moving and... It is the movement through railways that causes the least pollution. Rail, on an average is 2-5 times more energy efficient than Road, Shipping and Aviation.Through approaches including eco-driving, use of new rolling stock, and operational measures, railways continue to improve Railways: The Green Option-Sometfacts Of total C02 emission caused by transport, aviation contributes to 12 %, sea and waterways 12%, road transport 72% and only 1.6% is contributed by railways. The energy consumption by road transport is 82%,inland waterways 1.4%,aviation 14% and railways consume only 2.5% energy. Regarding the capacity of urban transport modes per meter of infrastructure width, a car carries 200 passengers, bus carries 1500 passengers and train carries 9000 passengers using the same infrastructure.
