I think the technology was not appropriate. There's new technology; look at Flyer, with its natural gas transit buses. Calgary has made a commitment for 200 natural gas buses. The biggest difference between Canada and the U.S. is the Clean Air Act in the U.S. L.A., for example, got rid of its last diesel in January of 2011. It operates on CNG completely. Companies like Flyer are producing really great product because the technology of the engines has changed dramatically.
On March 6th, 2012. See this statement in context.