Transportation has been the most challenging sector in Ontario for reductions in greenhouse gas (GHG) emissions. A paper by Transport Action Ontario shows that GHG emissions from diesel-based intercity passenger rail travel in Canada are about 2 to 3 times lower per passenger-km than emissions from equivalent travel by car or personal truck. Intercity passenger rail can therefore play an immediate significant role, at low cost and with other social/economic benefits, in achieving climate change targets.
The paper can be viewed here: TAO-RailandClimateChange