The insurance requirements are based on risk assessment and historical accident costs. The objective was to share accountability between shippers and railways for the transportation of designated dangerous goods. The amounts are set based on risk, and that's where the $1 billion comes from.
With respect to what the railways carry now, it is confidential information. I guess I would say that our assessment is that $1 billion currently.... Well, I'll say that there have been no rail accidents that have exceeded that level of insurance at this stage, and we believe, given the data we had, that it is sufficient to cover the vast majority of rail accidents.