Why is the train the most environmentally-friendly mode of transport?

The train is much more sustainable than the car or the aeroplane in terms of:

Why is the train the most environmentally-friendly mode of transport?

Comparing rail with road and air transport makes it possible to demonstrate that the train is much more sustainable, whether in terms of CO2 emissions, energy consumption, use of space, or noise levels. But rail transport’s environmental footprint can be reduced still further. To do so, we need to improve energy efficiency (efficiency of traction systems, improved electrical braking, LED lighting, optimised ventilation systems), reduce atmospheric emissions, and use clean, recyclable and natural materials.

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