To ask the Secretary of State for Transport what estimate her Department has made of the average volume of carbon dioxide emissions per passenger per kilometre for travel by rail. (168688)

The Department estimates that travel by rail in 2005-06 resulted in an average of 60 g of carbon dioxide emissions per passenger kilometre. A recent report by the Association of Train Operating Companies provides a slightly lower figure for 2006-07 of 58 g per passenger kilometre, reflecting both increased passenger numbers and the wider use of regenerative braking on electric trains.