The UK needs a "modal shift" from road to rail if greenhouse gas emissions from transport are to be curbed, a report concludes (link below.)
http://news.bbc.co.uk/1/hi/sci/tech/7277757.stm

The Institution of Mechanical Engineers (IMechE) says changes are needed to government policies on transport pricing, energy and town planning.

A train journey can produce about one tenth of the carbon emissions generated if the same trip is made by air.

The report's authors say substantial investment in the railways is needed.