"At a per-passenger-mile basis, rail is about three times as efficient as travel by car, in terms of fuel efficiency, and six times as efficient as travel by air, so there are pretty substantial pollution reduction benefits both in terms of greenhouse gases and other pollutants."

VOA: standard.2010.02.15

Liberals say the fuel-efficiency requirements for the replacement vehicles are not strong enough for the environment.

VOA: special.2009.08.07