I would say as far as how long it would take to replace those cars, you're limited to the capacity of what the manufacturers that make the cars can produce. As I understand, unless it has changed dramatically in the recent past, there's capacity out there for about 15,000 cars a year. The key point is, though, that the railways do not own these cars, so the decision-makers that have to make the decision to invest the money to convert the cars are actually the shippers, or the car owners or leasing companies, so it's beyond our realm and our ability to mandate that they do that.
On April 3rd, 2014. See this statement in context.