If we decided over time through a regulation that we wanted to specify maybe a higher portion than 12.5%, or a different percentage than is currently there, that would allow it. Different kinds of work may warrant higher percentages in different circumstances. With different classes of railways—maybe the class I's, the larger railways, versus the smaller short lines—the regulation would be able to write up some exemptions to that.
On May 28th, 2012. See this statement in context.